Can any one help me for the following question
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Maths --- Circle (urgent)
2011-05-01 10:07 pm
回答 (1)
2011-05-02 4:17 am
✔ 最佳答案
Draw AC∠ACB = 90 and ∠ACD = ∠ABD
∠CBD = (180 - 90 - ∠ABD)/2 = 45 - ∠ABD/2
So, 18 + 90 + ∠ABD + 45 - ∠ABD/2 + ∠ABD = 180
153 + 1.5∠ABD = 180
∠ABD = 18
So, ∠CBD = 45 - 9 = 36
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