math f.2 20點..快

2009-06-11 12:22 am
find the unknown.
圖.
http://hk.myblog.yahoo.com/ylf6b05/article?mid=33
更新1:

個答案系26 degree

更新2:

明晒,thx.=]

回答 (1)

2009-06-11 12:38 am
✔ 最佳答案
∠FAB=180-(3z+20)=160-3z
∠ABC=6z-6,∠BCD=4z,∠CDE=180-38=142,∠DEF=180-3z
Since ABCDEF is a hexagon, the total degree is 180(6-2)=720
So 160-3z+6z-6+4z+142+180-3z=720
4z+476=720
z=61

2009-06-10 17:05:33 補充:
加漏了160-3z+6z-6+4z+142+140+180-3z=720
4z+616=720
z=26


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