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因為弧ad=ac 所以圓周角∠cda=∠dca而∠adc和∠abc所對同一弧,故相等 所以∠dca=∠abc而∠cab又是△abc和△ace的公共角 所以兩個三角形相似,所以有:ac / ae = ab /ac 所以有ac^2 = ae * ab
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