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∵AB為直徑,∴∠ACB=90°,∵∠CAB=30°,∴∠ABC=60°,∴弧BC的度數=12弧AC的度數;∵AD=DC,∴弧AD的度數=弧DC的度數=12弧AC的度數,∴弧BC的度數=弧AD的度數;∴BC=AD.在Rt△ABC中∵∠CAB=30°,AC=23且BC= AC…
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