數學題:a trapezium ABCD with AB//CD.A line is drawn from A and D meet
at a point H, such that ∠BAH = ∠DAH and ∠ADH =∠CDH.Find ∠AHD.
要列式!
圖片參考：http://imgcld.yimg.com/8/n/HA05909411/o/701201250030713873424410.jpg
請數學高手!
2012-01-26 12:27 am
回答 (2)
2012-01-26 12:49 am
✔ 最佳答案
1 ∠BAD + ∠CDA = 180 (int. ∠s, AB // CD)Since ∠BAH = ∠DAH and ∠ADH =∠CDH
∠DAH + ∠ADH = 180/2 = 90
∠AHD + ∠DAH + ∠ADH = 180 (∠ sum of Δ)
∠AHD = 180 - ∠DAH - ∠ADH = 90
2012-01-26 2:36 am
90 90 90 90 90
收錄日期: 2021-04-26 19:16:59
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120125000051KK00307