中二數學一題【求完整解答及說明】

2014-02-17 6:06 pm
問題如下,請看圖:

http://upload.lsforum.net/users/public/l13249IMG_0001k69.jpg

等待回覆,謝謝!

回答 (1)

2014-02-17 6:16 pm
✔ 最佳答案
15+ angle DFC = 2x -------------(1) (ext . angle)
angle DFC =25 + x ----------------(2) ( ext . angle)

Put (2) into (1),
15+25+x =2x
40+x = 2x
x=40
參考: me


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