maths~~~~
2010-04-03 6:02 pm
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回答 (2)
2010-04-03 7:50 pm
✔ 最佳答案
∠GAD = 180 - p (∵AD//GH)∠EBC = ∠GAD = 180 -- p (∵BE//AG)
考慮 △BEC, q = ∠EBC + ∠BCE
q = 180 - p + r
p + q - r = 180
參考: Myself
2010-04-03 6:04 pm
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100403000051KK00364