Find x and y.
圖片參考：http://imgcld.yimg.com/8/n/HA00215765/o/701104210022613873429360.jpg
properties of circle (f.4)
2011-04-21 4:36 pm
回答 (1)
2011-04-21 4:57 pm
✔ 最佳答案
∠RTS = 90° (∠ in semi-circle)∠TRS + ∠TSR + ∠RTS = 180° (∠ sum of ∆)
x + ∠TSR + 90° = 180°
Hence, ∠TSR = 90° - x
Since ∠s in segment subtends arcs in ratio,
∠TRS/(arc TS) = ∠TSR/(arc TR)
x/2 = (90° - x)/3
3x = 180° - 2x
x = 36°
Similarly, ∠TRS/(arc TS) = ∠QRS/(arc QS)
36°/2 = 72°/y
y = 4
參考: miraco
收錄日期: 2021-05-03 20:21:37
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110421000051KK00226