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歡迎您訪問數學考題練習:下面四個命題中,正確的一個是!

數學考題練習:下面四個命題中,正確的一個是

更新時間:2024-01-12 12:59:34作者:貝語網校

下面四個命題中,正確的一個是

A.平分一條弦的直徑必垂直于這條弦

B.平分一條弧的直線垂直于這條弧所對的弦

C.圓心角相等,圓心角所對的弧相等

D.在一個圓中,平分一條弧和它所對弦的直線必經過這個圓的圓心

試題答案

D

試題解析

根據圓的有關性質即可求解.

解答:弦應是非直徑的弦,A錯;

過弧的中點的直線有無數條,B錯;

只有在同圓中,圓心角所對的弧相等,C錯;

故選D.

點評:本題考查常見的一些易錯的知識點,注意對定理的準確掌握.

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