Please help me !!!
About Maths Circle, please shows steps.
URL:
http://www.sendspace.com/file/xorznn
thank you !!!
circle question
2011-01-08 6:44 am
回答 (1)
2011-01-08 7:12 am
✔ 最佳答案
arc AB:BC:CE=3:7:8Let ∠AOB=3x, then ∠BOC=7x,∠COE=8x
=>x=10 (arcs prop. to ∠s at centre)
∠AOB=30, then ∠BOC=70,∠COE=80
∠ODC=70So CD=OD=R=(1/2)AE
AE=2CD
收錄日期: 2021-04-26 19:17:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110107000051KK01248