According to the figure, which of the following must be true?
A. a + b = c + d
B. a + d = b + c
C. a + b + c + d = 360
D. a + b + c + d = 540
E. 2a + 2b - c - d = 720
圖片參考：http://imgcld.yimg.com/8/n/HA00149615/o/701112250026613873415120.jpg
F4 Maths 283
2011-12-25 10:05 pm
回答 (3)
2011-12-25 10:23 pm
✔ 最佳答案
在角b和c畫平行線﹐則可以看出a + b = c + d = 180 + x (A)x是b和c分成2份後相等的那隻錯角
2012-01-12 1:23 am
2011-12-25 10:23 pm
你試下係b同c加兩條平行線
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