四年级下册数学同步练习-7单元3课时-三角形的内角和-苏教版
http://t.cn/Ri466E4苏教版小学数学四年级下册《三角形内角和》同步练习及参考答案一、选择1、把一个大三角形分成两个小三角形,每个小三角形的内角和是()A.90°B.180°C.60°2、在能组成三角形的是()A.90°50°40°B.100°32°19°C.50°50°50°D.60°60°60°E.120°30°30°F.98°35°47°3、三角形的两个内角分别为60度和45度,第三个内角是()度。A.100B.75C.105D.46二、填空在一个三角形中,∠1=42度,∠2=29度,∠3=__________度,教育1
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