求出下面图形中各角的度数 见图一
(1)∠1=180°-(90°+30°) =180°-120° =60°; (2)∠2=180°-(20°+35°) =180°-55° =125°; (3)∠3=180°-(40°+60°) =180°-100° =80°; ∠4=180°-∠3 =180°-80° =100°. 故答案为: