{"id":21149,"date":"2026-05-25T16:52:07","date_gmt":"2026-05-25T10:52:07","guid":{"rendered":"https:\/\/mcqacademy.com\/en\/mcq\/circle-circumference-using-radius-18\/"},"modified":"2026-05-25T16:52:07","modified_gmt":"2026-05-25T10:52:07","slug":"circle-circumference-using-radius-18","status":"publish","type":"mcq","link":"https:\/\/mcqacademy.com\/en\/mcq\/circle-circumference-using-radius-18\/","title":{"rendered":"Circle Circumference Using Radius"},"content":{"rendered":"<p>Using \u03c0 = 3.14, find the circumference of a circle with radius 51 mm.<\/p>\n<ul class=\"quiz-options\">\n<li>2601 mm<\/li>\n<li>160.14 mm<\/li>\n<li>8167.14 mm<\/li>\n<li>320.28 mm<\/li>\n<\/ul>\n","protected":false},"author":39,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","topic":[2875,2779],"subject":[2746],"education_level":[1894],"class_list":["post-21149","mcq","type-mcq","status-publish","hentry","topic-circle","topic-circumference","subject-mensuration","education_level-grade-8"],"mcq_note":"Circumference is the distance around a circle. Formula: C = 2\u03c0r. So C = 2 \u00d7 3.14 \u00d7 51 = 320.28 mm. Circumference is the boundary length of the circle, so the answer uses ordinary length units. Do not square the radius for circumference; squaring the radius is used in the area formula \u03c0r\u00b2. So the correct choice is 320.28 mm.","mcq_options":[{"right":"no","answer":"2601 mm"},{"right":"no","answer":"160.14 mm"},{"right":"no","answer":"8167.14 mm"},{"right":"yes","answer":"320.28 mm"}],"multi_answers":"no","subject_terms":[{"id":2746,"title":"Mensuration","slug":"mensuration"}],"topic_terms":[{"id":2875,"title":"Circle","slug":"circle"},{"id":2779,"title":"Circumference","slug":"circumference"}],"_links":{"self":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/mcq\/21149","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=21149"}],"wp:attachment":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/media?parent=21149"}],"wp:term":[{"taxonomy":"topic","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/topic?post=21149"},{"taxonomy":"subject","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/subject?post=21149"},{"taxonomy":"education_level","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/education_level?post=21149"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}