求 x。
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數學知識交流---圓(1)
2011-09-01 2:14 am
回答 (3)
2011-09-01 8:17 pm
✔ 最佳答案
Sol∠AOC=70度OC=OB∠OBC=35度X=90度－35度=55度
2011-09-01 4:29 am
∠COB = 180°-70°
= 110°
∠OBC = ∠OCB
∠OBC = (180° - 110°)/2
= 35°
∠OBQ = 90°
X+35° = 90°
X = 55°
= 110°
∠OBC = ∠OCB
∠OBC = (180° - 110°)/2
= 35°
∠OBQ = 90°
X+35° = 90°
X = 55°
2011-09-01 2:24 am
x = ∠CBQ = 55°
收錄日期: 2021-04-13 18:13:03
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110831000051KK00970