{"id":19716,"date":"2026-05-21T18:19:10","date_gmt":"2026-05-21T12:19:10","guid":{"rendered":"https:\/\/mcqacademy.com\/en\/mcq\/sine-cosine-complement-relation-10-and-80\/"},"modified":"2026-05-21T18:19:10","modified_gmt":"2026-05-21T12:19:10","slug":"sine-cosine-complement-relation-10-and-80","status":"publish","type":"mcq","link":"https:\/\/mcqacademy.com\/en\/mcq\/sine-cosine-complement-relation-10-and-80\/","title":{"rendered":"Sine cosine complement relation 10 and 80"},"content":{"rendered":"<p>If angle A = 10\u00b0 and angle B = 80\u00b0 in a right triangle, what is true about sin A and cos B?<\/p>\n\n<ul class=\"quiz-options wp-block-list\">\n<li>They are equal<\/li>\n<li>sin A is always 1<\/li>\n<li>cos B is always 0<\/li>\n<li>They are never related<\/li>\n<\/ul>\n","protected":false},"author":39,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","topic":[2803],"subject":[2745],"education_level":[2495],"class_list":["post-19716","mcq","type-mcq","status-publish","hentry","topic-complementary-angles","subject-trigonometry","education_level-grade-7"],"mcq_note":"Angles 10\u00b0 and 80\u00b0 are complementary because they add to 90\u00b0. For complementary angles, sin of one angle equals cos of the other, so sin 10\u00b0 = cos 80\u00b0.","mcq_options":[{"right":"yes","answer":"They are equal"},{"right":"no","answer":"sin A is always 1"},{"right":"no","answer":"cos B is always 0"},{"right":"no","answer":"They are never related"}],"multi_answers":"no","subject_terms":[{"id":2745,"title":"Trigonometry","slug":"trigonometry"}],"topic_terms":[{"id":2803,"title":"Complementary Angles","slug":"complementary-angles"}],"_links":{"self":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/mcq\/19716","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=19716"}],"wp:attachment":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/media?parent=19716"}],"wp:term":[{"taxonomy":"topic","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/topic?post=19716"},{"taxonomy":"subject","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/subject?post=19716"},{"taxonomy":"education_level","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/education_level?post=19716"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}