mid point them
2012-04-01 9:22 am
please show how to find JH by step
圖片參考：http://imgcld.yimg.com/8/n/HA00167623/o/701204010006213873386000.jpg
回答 (1)
2012-04-01 12:29 pm
✔ 最佳答案
AB // CD (mid-pt. theorem) ∠ AJB = ∠ CJD (vert. opp.∠s)
∠ JAB = ∠ JCD (alt.∠s, AB//CD)
∴ △CJD ~ △AJB(A.A.)
∴ AJ : JC = BJ : JD
22.5 : 9 = (JH + HB) : JD
5 : 2 = (JH + HB) : (DH - JH)
Since DH = HB = 14 (mid-pt. theorem)
∴
5 : 2 = (JH + 14) : (14 - JH)
2(JH + 14) = 5(14 - JH)
2JH + 28 = 70 - 5JH
7JH = 42
JH = 6
收錄日期: 2021-04-21 22:23:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120401000051KK00062