http://i831.photobucket.com/albums/zz231/Pocysim/01MathMC45.jpg
I have no idea about the answer
Can you show the step with reason ?
2001 CE Math mc 45
2012-04-11 2:20 am
回答 (1)
2012-04-11 7:24 am
✔ 最佳答案
首先, 在圓形內從C點往OB之間的圓邊拉1線，條線叫CZ好了。<ACD = <AZC = x (< in alt. segment )
<AZC + < BZC = 180 ( adj. <s on st. line)
<BZC = 180 - X
<ACZ = 90 (< in semi-circle)
<ACZ + <ACD + <BCZ = 180
X + 90 + <BCZ = 180
<BCZ = 90 - X
<BCZ + <CZB + < ZBC = 180 ( < sum of ^)
90 -X +180 - X + 28 = 180
X = 59
ANS: D
收錄日期: 2021-04-13 18:37:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120410000051KK00811