Maths problem: how to do, thanks.?
回答 (1)
2020-11-25 1:00 am
✔ 最佳答案
△FBC 等邊, 故等角, 故 ∠FBC = 60°□ABCD 是正方形, 所以 ∠ABF = 30°.
BF = BC = BA,
所以 △BFA 等腰,
∴ ∠AFB = ∠FAB = (180°-30°)/2 = 75°
∴ ∠AFE = 180° - 60° - 75° = 45°
收錄日期: 2021-04-24 08:07:06
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