如图，四边形ABCD内接于⊙O，AB是⊙O的直径，AC和BD相交于点E，且DC2=CE•CA．_刷题宝

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如图，四边形ABCD内接于⊙O，AB是⊙O的直径，AC和BD相交于点E，且DC²=CE•CA．

上一题下一题 0.0难度选择题更新时间:2019-07-26 08:38:46

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如图1，在直角梯形ABCD中，AD∥BC，∠BAD=

\frac{π}{2}

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（Ⅰ）证明：CD⊥平面A₁OC；

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