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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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