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练习：

练习：. 如图，已知在矩形 ABCD 中， AC ， BD 是对角线，过顶点 C 作 BD 的平行线与 AB 的延长线相交于点 E 。（ 1 ）求证：△ ACE 是等腰三角形。 补充问题： （ 2 ）当∠ BOC = 时，△ ACE 是等边三角形。 （ 3 ）若△ OBC 的面积是 6 ， 则△ ACE 的面积等于 。. 练习：. 等腰梯形的两底之差等于一腰长，则腰与下底的交角等于（ ） （ A ） 15° （ B ） 30° （ C ） 45° （ D ） 60°.

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练习：

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  1. 练习： 如图，已知在矩形ABCD中，AC，BD是对角线，过顶点C作BD的平行线与AB的延长线相交于点E。（1）求证：△ACE是等腰三角形。 补充问题：（2）当∠BOC= 时，△ACE是等边三角形。 （3）若△OBC的面积是6， 则△ACE的面积等于 。

  2. 练习： 等腰梯形的两底之差等于一腰长，则腰与下底的交角等于（ ） （A）15°（B）30°（C）45°（D）60°

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