{"id":108,"date":"2023-07-29T18:32:39","date_gmt":"2023-07-29T22:32:39","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/?post_type=chapter&#038;p=108"},"modified":"2023-11-02T14:16:27","modified_gmt":"2023-11-02T18:16:27","slug":"understanding-degrees","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/chapter\/understanding-degrees\/","title":{"raw":"Understanding Degrees","rendered":"Understanding Degrees"},"content":{"raw":"We can measure <strong>angles in degrees.<\/strong> There are 360 degrees in one <strong>full rotation <\/strong>(one complete circle around).\r\n\r\nThe <strong>degree<\/strong> symbol =<strong> \u00b0<\/strong>\r\n\r\nWe use a little <strong>circle \u00b0<\/strong> following the number to mean degrees.\r\n\r\nFor example, 90\u00b0 means 90 degrees\r\n\r\nA <strong>full circle<\/strong> is 360\u00b0\r\n<strong>Half a circle<\/strong> is 180\u00b0 (called a <strong>straight angle)<\/strong>\r\nThe <strong>quarter of a circle<\/strong> is 90\u00b0 (called a <strong>right angle<\/strong>)\r\n\r\nWhy 360 degrees? Maybe because of old calendars (such as the Persian Calendar) used 360 days for a year - when they watched the stars they saw them revolve around the North Star one degree per day.\r\n\r\nAlso, 360 can be divided exactly by 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120 and 180, which makes a lot of basic geometry easier.\r\n\r\n<img class=\"alignnone size-full wp-image-668\" src=\"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Joke-5-1.png\" alt=\"\" width=\"771\" height=\"432\" \/>","rendered":"<p>We can measure <strong>angles in degrees.<\/strong> There are 360 degrees in one <strong>full rotation <\/strong>(one complete circle around).<\/p>\n<p>The <strong>degree<\/strong> symbol =<strong> \u00b0<\/strong><\/p>\n<p>We use a little <strong>circle \u00b0<\/strong> following the number to mean degrees.<\/p>\n<p>For example, 90\u00b0 means 90 degrees<\/p>\n<p>A <strong>full circle<\/strong> is 360\u00b0<br \/>\n<strong>Half a circle<\/strong> is 180\u00b0 (called a <strong>straight angle)<\/strong><br \/>\nThe <strong>quarter of a circle<\/strong> is 90\u00b0 (called a <strong>right angle<\/strong>)<\/p>\n<p>Why 360 degrees? Maybe because of old calendars (such as the Persian Calendar) used 360 days for a year &#8211; when they watched the stars they saw them revolve around the North Star one degree per day.<\/p>\n<p>Also, 360 can be divided exactly by 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120 and 180, which makes a lot of basic geometry easier.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-668\" src=\"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Joke-5-1.png\" alt=\"\" width=\"771\" height=\"432\" \/><\/p>\n","protected":false},"author":2001,"menu_order":2,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-108","chapter","type-chapter","status-publish","hentry"],"part":92,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapters\/108","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/wp\/v2\/users\/2001"}],"version-history":[{"count":4,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapters\/108\/revisions"}],"predecessor-version":[{"id":868,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapters\/108\/revisions\/868"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/parts\/92"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapters\/108\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/wp\/v2\/media?parent=108"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapter-type?post=108"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/wp\/v2\/contributor?post=108"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/wp\/v2\/license?post=108"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}