问题 选择题

以下四个命题正确的是(  )

A.任意三点可以确定一个圆

B.菱形对角线相等

C.直角三角形斜边上的中线等于斜边的一半

D.平行四边形的四条边相等

答案

答案:C

题目分析:A、不在同一直线上的三点确定一个圆,故A错误;

B、菱形的对角线垂直但不一定相等,故B错误;

C、正确;

D、平行四边形的四条边不一定相等.故D错误

故选C.

阅读理解

阅读理解

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