{"id":441,"date":"2022-04-12T10:35:51","date_gmt":"2022-04-12T10:35:51","guid":{"rendered":"http:\/\/7thclass.deltapublications.in\/?page_id=441"},"modified":"2025-11-10T05:38:49","modified_gmt":"2025-11-10T05:38:49","slug":"w-1-perimeter","status":"publish","type":"page","link":"https:\/\/7thclass.deltapublications.in\/index.php\/w-1-perimeter\/","title":{"rendered":"W.1 Perimeter"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong> Perimeter<\/strong><\/h2>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<div style=\"position: relative; width: 100%; height: 0; padding-top: 56.2500%;\n padding-bottom: 0; box-shadow: 0 2px 8px 0 rgba(63,69,81,0.16); margin-top: 1.6em; margin-bottom: 0.9em; overflow: hidden;\n border-radius: 8px; will-change: transform;\">\n  <iframe loading=\"lazy\" style=\"position: absolute; width: 100%; height: 100%; top: 0; left: 0; border: none; padding: 0;margin: 0;\"\n    src=\"https:\/\/www.canva.com\/design\/DAG2-qODrrs\/xlW6u_JiPSVJAOTWv8wR5g\/watch?embed\" allowfullscreen=\"allowfullscreen\" allow=\"fullscreen\">\n  <\/iframe>\n<\/div>\n<a href=\"https:&#x2F;&#x2F;www.canva.com&#x2F;design&#x2F;DAG2-qODrrs&#x2F;xlW6u_JiPSVJAOTWv8wR5g&#x2F;watch?utm_content=DAG2-qODrrs&amp;utm_campaign=designshare&amp;utm_medium=embeds&amp;utm_source=link\" target=\"_blank\" rel=\"noopener\">Forum<\/a> by Delta publications\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-text-color has-huge-font-size\" style=\"color:#74008b\">key notes :<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong>Definition of Perimeter<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The <strong>perimeter<\/strong> of a closed figure is the <strong>total distance around the figure<\/strong>.<\/p>\n\n\n\n<p>In simple words, it is the <strong>sum of the lengths of all sides<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong>Perimeter of Basic Shapes<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Square<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>All sides are equal.<\/li>\n\n\n\n<li><strong>Formula:<\/strong> <\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\">Perimeter=4\u00d7side<\/p>\n\n\n\n<p><strong>Rectangle<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Opposite sides are equal.<\/li>\n\n\n\n<li><strong>Formula:<\/strong> <\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\">Perimeter=2\u00d7(Length+Breadth)<\/p>\n\n\n\n<p><strong>Triangle<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sum of the lengths of all three sides.<\/li>\n\n\n\n<li><strong>Formula:<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\"> Perimeter=a+b+c<\/p>\n\n\n\n<p><strong>Parallelogram<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Opposite sides are equal.<\/li>\n\n\n\n<li><strong>Formula:<\/strong> <\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\">Perimeter=2\u00d7(Base+Side)<\/p>\n\n\n\n<p><strong>Rhombus<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>All sides are equal.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Formula:<\/strong> <\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\">Perimeter=4\u00d7side<\/p>\n\n\n\n<p><strong>Circle<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Perimeter of a circle is called the <strong>Circumference<\/strong>.<\/li>\n\n\n\n<li><strong>Formula:<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\">                            Circumference=2\u03c0r or \u03c0d<\/p>\n\n\n\n<p class=\"has-text-align-center\"> (where r=radius,\u2005\u200ad=diameter)                       <\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong>Units of Perimeter<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Always measured in <strong>units of length<\/strong>.<\/p>\n\n\n\n<p>Example: cm, m, km, inches, feet, etc.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong>Important Points<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>longer the boundary<\/strong>, the larger the perimeter.<\/li>\n\n\n\n<li>Perimeter helps us to find <strong>fencing length<\/strong>, <strong>wire around shapes<\/strong>, or <strong>distance walked around a figure<\/strong>.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong>Solved Examples<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Example 1:<\/strong><br>Find the perimeter of a rectangle with length 12\u2009cm and breadth 8\u2009cm<\/p>\n\n\n\n<p class=\"has-text-align-center\"> P=2\u00d7(12+8)=2\u00d720=40\u2009cm<\/p>\n\n\n\n<p><strong>Example 2:<\/strong><br>A square field has a side of 25\u2009m.  Find its perimeter.<\/p>\n\n\n\n<p class=\"has-text-align-center\"> P=4\u00d725=100\u2009m<\/p>\n\n\n\n<p><strong>Example 3:<\/strong><br>Find the circumference of a circle of radius 7\u2009cm<\/p>\n\n\n\n<p class=\"has-text-align-center\">C=2\u03c0r=2\u00d722\/7\u200b\u00d77=44cm<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong>Practice Questions<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Find the perimeter of a triangle with sides 8\u2009cm,6\u2009cm,10\u2009cm<\/li>\n\n\n\n<li>A rectangular park has length 40\u2009m and breadth 25\u2009m. Find its perimeter.<\/li>\n\n\n\n<li>Find the perimeter of a square having side 15\u2009m<\/li>\n\n\n\n<li>Find the circumference of a circle of diameter14cm.<\/li>\n<\/ol>\n\n\n\n<p class=\"has-text-align-center has-text-color has-huge-font-size\" style=\"color:#105000\"><strong>Learn with an example<\/strong><\/p>\n\n\n\n<div class=\"wp-block-group has-primary-color has-text-color has-background has-normal-font-size\" style=\"background-color:#f8b2b2\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group has-background-background-color has-background\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"has-text-color\" style=\"color:#b00012\">\u27a1\ufe0f <strong>What&nbsp;is the perimeter of this&nbsp;parallelogram?<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-13.png\" alt=\"\" class=\"wp-image-5248\" style=\"aspect-ratio:1;width:304px;height:auto\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-13.png 500w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-13-300x300.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-13-150x150.png 150w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-13-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/figure><\/div>\n\n\n<p>_____ &nbsp;centimetres<\/p>\n<\/div><\/div>\n\n\n\n<p>In&nbsp;a parallelogram, opposite sides have the same length. Look at the parallelogram and find the side lengths.&nbsp;add:<\/p>\n\n\n\n<p>8 + 10 + 8 + 10 = 36<\/p>\n\n\n\n<p>Now&nbsp;find the units. The lengths are measured in centimetres, so the perimeter is also measured in&nbsp;centimetres.<\/p>\n\n\n\n<p>The perimeter is 36 centimetres.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-primary-color has-text-color has-background has-normal-font-size\" style=\"background-color:#b4bcf2\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group has-primary-color has-background-background-color has-text-color has-background\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"has-text-color\" style=\"color:#b00012\">\u27a1\ufe0f <strong>What&nbsp;is the&nbsp;perimeter?<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-1-3.png\" alt=\"\" class=\"wp-image-5249\" style=\"aspect-ratio:1;width:299px;height:auto\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-1-3.png 500w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-1-3-300x300.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-1-3-150x150.png 150w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-1-3-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/figure><\/div>\n\n\n<p>______ &nbsp;kilometres<\/p>\n<\/div><\/div>\n\n\n\n<p>Look&nbsp;at the shape and find the length of each side. Add the&nbsp;lengths:<\/p>\n\n\n\n<p>20 + 16 + 12 = 48<\/p>\n\n\n\n<p>Now&nbsp;find the units. The lengths are measured in kilometres, so the perimeter is also measured in&nbsp;kilometres.<\/p>\n<\/div><\/div>\n\n\n\n<p>The&nbsp;perimeter is&nbsp;48&nbsp;kilometres.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-primary-color has-text-color has-background has-normal-font-size\" style=\"background-color:#fdf2aa\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group has-primary-color has-background-background-color has-text-color has-background\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"has-text-color\" style=\"color:#b00012\">\u27a1\ufe0f<strong> Look&nbsp;at this parallelogram. Find the value of&nbsp;a.<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-2-5.png\" alt=\"\" class=\"wp-image-5250\" style=\"aspect-ratio:1;width:280px;height:auto\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-2-5.png 500w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-2-5-300x300.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-2-5-150x150.png 150w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/02\/Untitled-design-2-5-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/figure><\/div>\n\n\n<p>Perimeter=18&nbsp;centimetres<\/p>\n\n\n\n<p>a= _______&nbsp;centimetres<\/p>\n<\/div><\/div>\n\n\n\n<p>In&nbsp;a parallelogram, opposite sides have the same length. Add the lengths of the&nbsp;sides:<\/p>\n\n\n\n<p>a + 6 + a + 6 = 18<\/p>\n\n\n\n<p>2a + 12 = 18<\/p>\n\n\n\n<p>Subtract&nbsp;12&nbsp;from each side. Then, divide by&nbsp;2. <\/p>\n\n\n\n<p>2a=6<\/p>\n\n\n\n<p>Now look for the units. The units are centimetres. So, a = 3 centimetres.<\/p>\n<\/div><\/div>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#d90000\">Let&#8217;s practice!\ud83d\udd8a\ufe0f<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/101652\/249\/550\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-2-125.png\" alt=\"\" class=\"wp-image-6872\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-2-125.png 500w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-2-125-300x300.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-2-125-150x150.png 150w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-2-125-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/101652\/461\/701\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-1-1-127.png\" alt=\"\" class=\"wp-image-6873\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-1-1-127.png 500w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-1-1-127-300x300.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-1-1-127-150x150.png 150w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-1-1-127-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Perimeter Forum by Delta publications key notes : Definition of Perimeter The perimeter of a closed figure is the total distance around the figure. In simple words, it is the sum of the lengths of all sides. Perimeter of Basic Shapes Square Perimeter=4\u00d7side Rectangle Perimeter=2\u00d7(Length+Breadth) Triangle Perimeter=a+b+c Parallelogram Perimeter=2\u00d7(Base+Side) Rhombus Perimeter=4\u00d7side Circle Circumference=2\u03c0r or \u03c0d<a class=\"more-link\" href=\"https:\/\/7thclass.deltapublications.in\/index.php\/w-1-perimeter\/\">Continue reading <span class=\"screen-reader-text\">&#8220;W.1 Perimeter&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"footnotes":""},"class_list":["post-441","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=441"}],"version-history":[{"count":25,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/441\/revisions"}],"predecessor-version":[{"id":17549,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/441\/revisions\/17549"}],"wp:attachment":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}