{"id":102,"date":"2022-04-13T08:20:53","date_gmt":"2022-04-13T08:20:53","guid":{"rendered":"http:\/\/9thclass.deltapublications.in\/?page_id=102"},"modified":"2025-10-29T11:18:22","modified_gmt":"2025-10-29T11:18:22","slug":"g-1-classify-triangles","status":"publish","type":"page","link":"https:\/\/9thclass.deltapublications.in\/index.php\/g-1-classify-triangles\/","title":{"rendered":"G.1 Classify triangles"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>Classify triangles<\/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 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\/DAG3Kxz596A\/E5THdWBSalXUW1gP5-Fl-A\/watch?embed\" allowfullscreen=\"allowfullscreen\" allow=\"fullscreen\">\n  <\/iframe>\n<\/div>\n<a href=\"https:&#x2F;&#x2F;www.canva.com&#x2F;design&#x2F;DAG3Kxz596A&#x2F;E5THdWBSalXUW1gP5-Fl-A&#x2F;watch?utm_content=DAG3Kxz596A&amp;utm_campaign=designshare&amp;utm_medium=embeds&amp;utm_source=link\" target=\"_blank\" rel=\"noopener\">Design<\/a> by Delta publications\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-text-color has-huge-font-size\" style=\"color:#74008b;text-transform:capitalize\"><strong>key notes :<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-a202732c2cea8e29a5e775f31e36a80a\" style=\"color:#000060\">\ud83d\udd3a <strong>CLASSIFY TRIANGLES<\/strong> \ud83d\udd3a<\/h2>\n\n\n\n<p>Triangles can be classified based on <strong>sides<\/strong> and <strong>angles<\/strong>!<br>Let\u2019s explore both \ud83d\udc47<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-05782286a98f19153304bb45d00d276a\" style=\"color:#000060\">\ud83d\udfe2 <strong>Classification by Sides<\/strong><\/h3>\n\n\n\n<p>1\ufe0f\u20e3 <strong>Equilateral Triangle<\/strong> \ud83d\udd39<\/p>\n\n\n\n<p>\ud83d\udc49 All <strong>three sides are equal<\/strong>.<br>\ud83d\udc49 All <strong>three angles are 60\u00b0<\/strong>.<br>\u2728 Example: \u25b3ABC where AB = BC = CA<\/p>\n\n\n\n<p>\ud83d\udca1 <em>Tip:<\/em> \u201cEqui\u201d means equal \u2013 easy to remember! \u2696\ufe0f<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>2\ufe0f\u20e3 <strong>Isosceles Triangle<\/strong> \ud83d\udd38<\/p>\n\n\n\n<p>\ud83d\udc49 <strong>Two sides are equal<\/strong>.<br>\ud83d\udc49 <strong>Two angles<\/strong> opposite those sides are also <strong>equal<\/strong>.<br>\u2728 Example: \u25b3PQR where PQ = PR<\/p>\n\n\n\n<p>\ud83d\udca1 <em>Tip:<\/em> \u201cIso\u201d means same \u2013 two sides same! \ud83d\ude04<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>3\ufe0f\u20e3 <strong>Scalene Triangle<\/strong> \ud83d\udd3a<\/p>\n\n\n\n<p>\ud83d\udc49 <strong>All sides are different<\/strong>.<br>\ud83d\udc49 <strong>All angles are different<\/strong>.<br>\u2728 Example: \u25b3XYZ where XY \u2260 YZ \u2260 ZX<\/p>\n\n\n\n<p>\ud83d\udca1 <em>Tip:<\/em> \u201cScalene\u201d = \u201cScale of difference\u201d \ud83c\udf9a\ufe0f<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-df8727c41deaefb756ad204e94c2338f\" style=\"color:#000060\">\ud83d\udd35 <strong>Classification by Angles<\/strong><\/h3>\n\n\n\n<p>1\ufe0f\u20e3 <strong>Acute-angled Triangle<\/strong> \ud83c\udf1e<\/p>\n\n\n\n<p>\ud83d\udc49 All <strong>angles are less than 90\u00b0<\/strong>.<br>\u2728 Example: 50\u00b0, 60\u00b0, 70\u00b0<\/p>\n\n\n\n<p>\ud83d\udca1 <em>Tip:<\/em> \u201cAcute\u201d = cute little angles \ud83d\udc96<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>2\ufe0f\u20e3 <strong>Right-angled Triangle<\/strong> \ud83d\udccf<\/p>\n\n\n\n<p>\ud83d\udc49 Has <strong>one 90\u00b0 angle<\/strong>.<br>\ud83d\udc49 Follows <strong>Pythagoras Theorem<\/strong>:<br>a<sup>2<\/sup>+b<sup>2<\/sup>=c<sup>2<\/sup><br>\u2728 Example: 3-4-5 triangle<\/p>\n\n\n\n<p>\ud83d\udca1 <em>Tip:<\/em> Think of it like a \u201ccorner\u201d \ud83d\udc5f<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>3\ufe0f\u20e3 <strong>Obtuse-angled Triangle<\/strong> \ud83c\udf19<\/p>\n\n\n\n<p>\ud83d\udc49 Has <strong>one angle greater than 90\u00b0<\/strong>.<br>\ud83d\udc49 The other two angles are <strong>acute<\/strong>.<br>\u2728 Example: 120\u00b0, 30\u00b0, 30\u00b0<\/p>\n\n\n\n<p>\ud83d\udca1 <em>Tip:<\/em> \u201cObtuse\u201d = \u201cBig and broad\u201d \ud83d\ude34<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-3fa9074d6fcf4f605ccc4179041548c9\" style=\"color:#000060\">\ud83d\udcab <strong>Bonus Facts!<\/strong><\/h3>\n\n\n\n<p>\u2705 The <strong>sum of all interior angles<\/strong> of a triangle = <strong>180\u00b0<\/strong> \ud83e\uddee<br>\u2705 A triangle is the <strong>simplest polygon<\/strong> (3 sides).<br>\u2705 The <strong>area<\/strong> of a triangle = <\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>Area = 1\/2 \u00d7 base \u00d7 height<\/strong><\/p>\n\n\n\n<p>\u2705 The <strong>perimeter<\/strong> = sum of all sides.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-32a9e91dc664a09bee48a8ba3aba5c8a\" style=\"color:#000060\">\ud83e\udde0 <strong>Quick Recap Table<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Type<\/th><th>Based On<\/th><th>Property<\/th><th>Example<\/th><\/tr><\/thead><tbody><tr><td>Equilateral<\/td><td>Sides<\/td><td>All sides &amp; angles equal<\/td><td>60\u00b0, 60\u00b0, 60\u00b0<\/td><\/tr><tr><td>Isosceles<\/td><td>Sides<\/td><td>2 sides equal<\/td><td>70\u00b0, 70\u00b0, 40\u00b0<\/td><\/tr><tr><td>Scalene<\/td><td>Sides<\/td><td>All sides different<\/td><td>50\u00b0, 60\u00b0, 70\u00b0<\/td><\/tr><tr><td>Acute<\/td><td>Angles<\/td><td>All &lt; 90\u00b0<\/td><td>50\u00b0, 60\u00b0, 70\u00b0<\/td><\/tr><tr><td>Right<\/td><td>Angles<\/td><td>One = 90\u00b0<\/td><td>30\u00b0, 60\u00b0, 90\u00b0<\/td><\/tr><tr><td>Obtuse<\/td><td>Angles<\/td><td>One &gt; 90\u00b0<\/td><td>30\u00b0, 30\u00b0, 120\u00b0<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-715708a7d6e295861238ef3f6931afa4\" style=\"color:#000060\">\ud83c\udf1f <strong>Remember:<\/strong><\/p>\n\n\n\n<p>\u27a1\ufe0f Every triangle has <strong>3 sides, 3 angles, and 3 vertices!<\/strong><br>\u27a1\ufe0f It\u2019s the <strong>strongest shape<\/strong> in geometry \ud83d\udcaa\ud83d\udd3a<\/p>\n\n\n\n<p class=\"has-text-align-center has-text-color has-large-font-size\" style=\"color:#105000\"><strong>Learn with an example<\/strong><\/p>\n\n\n\n<div class=\"wp-block-group has-background has-large-font-size\" style=\"background-color:#11ac23\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group has-background-background-color has-background\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-color\" style=\"color:#b00012\"><strong>A triangle has angle measurements of 86\u00b0, 77\u00b0 and 17\u00b0. What kind of triangle is it?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-large-font-size\">acute<\/li>\n\n\n\n<li>right<\/li>\n\n\n\n<li>obtuse<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p class=\"has-background-color has-text-color\">This triangle is an acute triangle. All 3 angles are less than 90\u00b0.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-background has-large-font-size\" style=\"background-color:#540404\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group has-background-background-color has-background\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-color\" style=\"color:#b00012\"><strong>What kind of triangle is this?<\/strong><\/p>\n\n\n<div class=\"wp-block-image is-resized\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/06\/Untitled-design-2-1.png\" alt=\"\" class=\"wp-image-8454\" style=\"width:304px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/06\/Untitled-design-2-1.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/06\/Untitled-design-2-1-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/06\/Untitled-design-2-1-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>equilateral<\/li>\n\n\n\n<li>isosceles but not equilateral<\/li>\n\n\n\n<li>scalene<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p class=\"has-background-color has-text-color\">Look at this triangle:<\/p>\n\n\n<div class=\"wp-block-image is-resized\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/06\/Untitled_design__2_-removebg-preview-4.png\" alt=\"\" class=\"wp-image-8455\" style=\"width:276px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/06\/Untitled_design__2_-removebg-preview-4.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/06\/Untitled_design__2_-removebg-preview-4-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/06\/Untitled_design__2_-removebg-preview-4-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/figure><\/div>\n\n\n<p class=\"has-background-color has-text-color\">This triangle is isosceles but not equilateral. 2 angles are the same, but the third angle is different.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-background has-large-font-size\" style=\"background-color:#49043a\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group has-background-background-color has-background\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-color\" style=\"color:#b00012\"><strong>A triangle has angle measurements of 90\u00b0, 16\u00b0 and 74\u00b0. What kind of triangle is it?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>acute<\/li>\n\n\n\n<li>right<\/li>\n\n\n\n<li>obtuse<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p class=\"has-background-color has-text-color\">This triangle is a right triangle. The 90\u00b0 angle is a right angle.<\/p>\n<\/div><\/div>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#d90000\">Let&#8217;s practice!<\/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\/81291\/393\/743\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-3-37.png\" alt=\"\" class=\"wp-image-7769\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-3-37.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-3-37-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-3-37-150x150.png 150w\" 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\/81095\/401\/663\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-1-2-42.png\" alt=\"\" class=\"wp-image-7770\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-1-2-42.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-1-2-42-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/05\/Worksheet-1-1-2-42-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Classify triangles Design by Delta publications key notes : \ud83d\udd3a CLASSIFY TRIANGLES \ud83d\udd3a Triangles can be classified based on sides and angles!Let\u2019s explore both \ud83d\udc47 \ud83d\udfe2 Classification by Sides 1\ufe0f\u20e3 Equilateral Triangle \ud83d\udd39 \ud83d\udc49 All three sides are equal.\ud83d\udc49 All three angles are 60\u00b0.\u2728 Example: \u25b3ABC where AB = BC = CA \ud83d\udca1 Tip: \u201cEqui\u201d<a class=\"more-link\" href=\"https:\/\/9thclass.deltapublications.in\/index.php\/g-1-classify-triangles\/\">Continue reading <span class=\"screen-reader-text\">&#8220;G.1 Classify triangles&#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,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-102","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/102","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=102"}],"version-history":[{"count":23,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/102\/revisions"}],"predecessor-version":[{"id":18151,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/102\/revisions\/18151"}],"wp:attachment":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}