题目

如图, ∠AOD= ∠DOB = ∠COE = 90° ,互补的角有( ) A. 5 对 B. 6 对 C. 7 对 D. 8 对 答案:A【分析】 根据补角的概念解答即可. 【详解】 解:互补的角有: ∠AOD与 ∠BOD , ∠AOD 与 ∠COE , ∠COE 与 ∠BOD , ∠AOC 与 ∠BOC , ∠AOE 与 ∠BOE 共 5 对, 故选: A. 【点睛】 本题考查的是补角的概念,如果两个角的和等于 180°,就说这两个角互为补角.—You’ve won the drawing competition. Congratulations! Among all the pictures in the competition,I found _______was really amazing. By the way, when did you draw it? —During the trip to the Sydney Opera House _______ September.A.yours; inB.yours; onC.you; inD.you; on
数学 试题推荐