发布网友 发布时间:2022-05-25 12:28
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热心网友 时间:2023-05-19 03:56
因为ABCD为菱形,AB = BC => ½AB = ½BC => BE = BF
=> ∠2 = ∠3 = (180° - 80°)/2 = 50°
=> ∠5 = 90° - 50° = 40°
因为EBCP为直角梯形,因此斜边中点到两直角等距 => EF = PF
=> ∠6 = ∠5 = 40°
=> ∠1 = 90° - ∠6 = 50°