maths~~~~

👨🏻‍🏫 學術台數學

2009-10-30 1:58 am

As follows:

圖片參考：http://i.imagehost.org/0509/ScreenHunter_03_Oct_29_17_56.gif

回答 (2)

2009-10-30 2:07 am

✔ 最佳答案

Angle ABC = 180 - x - y = z

Angle EDF = 180 - x - z = y

So △ABC~△FED (A.A.A.)

EF / AB = FD / AC

20 / 16 = FD / 20

FD =25

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2009-10-30 2:09 am

DF的長度是25cm.

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