在半径为4CM 的圆O中,有一条弦AC与直径AB成60°的角,试求点O到弦AC的距离
在半径为4CM 的圆O中,有一条弦AC与直径AB成60°的角,试求点O到弦AC的距离
数学人气:859 ℃时间:2020-06-02 01:05:25
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作OD⊥AC,垂足为D,∵∠CAB=60°,点C在⊙O上.∴∠ACB=90°,∠B=30°∵ AB=8, ∠B=30°∴AC=4 ∵OD⊥AC, AC=4∴AD=2,OA=4 在Rt⊿OAD中. OD=√(OA²-AD²)=√(4²-2...
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