{"id":20151,"date":"2026-05-21T23:45:29","date_gmt":"2026-05-21T17:45:29","guid":{"rendered":"https:\/\/mcqacademy.com\/en\/mcq\/using-22-7-find-the-area-of-a-circle-with-radius-21-cm\/"},"modified":"2026-05-21T23:45:29","modified_gmt":"2026-05-21T17:45:29","slug":"using-22-7-find-the-area-of-a-circle-with-radius-21-cm","status":"publish","type":"mcq","link":"https:\/\/mcqacademy.com\/en\/mcq\/using-22-7-find-the-area-of-a-circle-with-radius-21-cm\/","title":{"rendered":"Using \u03c0 = 22\/7, find the area of a circle with radius 21 cm."},"content":{"rendered":"<p>Using \u03c0 = 22\/7, find the area of a circle with radius 21 cm.<\/p>\n\n<ul class=\"quiz-options wp-block-list\">\n<li>132 cm\u00b2<\/li>\n<li>1386 cm\u00b2<\/li>\n<li>441 cm\u00b2<\/li>\n<li>66 cm\u00b2<\/li>\n<\/ul>\n","protected":false},"author":39,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","topic":[2851],"subject":[2746],"education_level":[2495],"class_list":["post-20151","mcq","type-mcq","status-publish","hentry","topic-area-of-circle","subject-mensuration","education_level-grade-7"],"mcq_note":"Area of a circle = \u03c0 \u00d7 r\u00b2 = 3.14286 \u00d7 21 \u00d7 21 = 1386 cm\u00b2. The radius is used twice in r\u00b2, so be careful not to use the diameter directly in this formula. Squaring the radius means multiplying the radius by itself before multiplying by \u03c0. This formula measures the flat surface inside the circle, so the final unit must be a square unit such as cm\u00b2.","mcq_options":[{"right":"no","answer":"132 cm\u00b2"},{"right":"yes","answer":"1386 cm\u00b2"},{"right":"no","answer":"441 cm\u00b2"},{"right":"no","answer":"66 cm\u00b2"}],"multi_answers":"no","subject_terms":[{"id":2746,"title":"Mensuration","slug":"mensuration"}],"topic_terms":[{"id":2851,"title":"Area of Circle","slug":"area-of-circle"}],"_links":{"self":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/mcq\/20151","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/mcq"}],"about":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/types\/mcq"}],"author":[{"embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/users\/39"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/comments?post=20151"}],"wp:attachment":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/media?parent=20151"}],"wp:term":[{"taxonomy":"topic","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/topic?post=20151"},{"taxonomy":"subject","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/subject?post=20151"},{"taxonomy":"education_level","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/education_level?post=20151"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}