As follows:
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maths~``
2009-11-14 4:48 am
回答 (2)
2009-11-14 4:52 am
✔ 最佳答案
ㄥACD = ㄥDCB - ㄥACB= (180 - 64*2) - (180 - 128)/2
= 52 - 26
= 26度
2009-11-14 6:24 am
Since BA = AC, therefore angle CBA = angle BCA = (180-128)/2 = 26 degree.
But DC = BC, so that angle CDB = angle CBD = 64 degree, and angle DCB = 180 - 64 - 64 = 52 degree
Hence angle ACD = 52 - 26 = 26 degree.
But DC = BC, so that angle CDB = angle CBD = 64 degree, and angle DCB = 180 - 64 - 64 = 52 degree
Hence angle ACD = 52 - 26 = 26 degree.
收錄日期: 2021-04-21 22:06:31
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091113000051KK01289