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练习课

练习课. 1. 已知平行四边形的三个顶点坐标分别为（ 0 ， 0 ）、 （ 0 ， 4 ）（ 3 ， 1 ），则第四个顶点的坐标为 __________ _____ 。. (3,5),(3,-3),(-3,3). D. E. A. F. C. B. 3. 已知如图，以△ ABC 的三边为边在 BC 的同侧分别作三个等边△ ABD 、△ BCE 、△ ACF ，请回答下列问题，并证明。（ 1 ）四边形 ADEF 是什么四边形？. （ 2 ） 探究： 当△ ABC 满足什么条件时，四 　边形 ADEF 是矩形；. D. E. A. F. C. B.

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练习课

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  1. 练习课

  2. 1.已知平行四边形的三个顶点坐标分别为（0，0）、1.已知平行四边形的三个顶点坐标分别为（0，0）、 （0，4）（3，1），则第四个顶点的坐标为__________ _____。 (3,5),(3,-3),(-3,3)

  3. D E A F C B 3.已知如图，以△ABC的三边为边在BC的同侧分别作三个等边△ABD、△BCE、△ACF，请回答下列问题，并证明。（1）四边形ADEF是什么四边形？ （2）探究：当△ABC满足什么条件时，四 　边形ADEF是矩形；

  4. D E A F C B 变式： 以 AFED的边AF，AD为边作正三角形ADB，ACF，探索△BCE是什么三角形.

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