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答案唔岩...><"
F.4 maths...
2008-04-08 5:37 am
回答 (2)
2008-04-08 6:07 am
✔ 最佳答案
2a)Since AP is tangent∴OA⊥AP (tangent ⊥ radius)
∴∠OAP = 900
∠OAP + ∠OPA+ ∠AOP= 1800 (∠sum of Δ)
x + 900 + 420 = 1800
x + 1320 = 1800
x = 480
∴y = 480 (∠s in the same segment)
2008-04-07 22:08:30 補充：
個0細d的是角度
例如x = 48°，而不是480
2008-04-08 6:09 am
angle OAP = 90度 (tangent propoties)
x = 180度-90度-42度 = 48度 ( angle sum of triangle)
y=x=48度 ( angles in the same segment)
x = 180度-90度-42度 = 48度 ( angle sum of triangle)
y=x=48度 ( angles in the same segment)
參考: me
收錄日期: 2021-04-23 22:55:34
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080407000051KK02823