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大家觉得平行四边形及特殊的平行四边形的判定这部分内容难吗?今天,我给大家请来了辛老师,且看他如何说．平行四边形的判定方法:(1)两组对边分别平行的四边形是平行四边形;(2)两组对边分别相等的四边形是平行四边形;(3)一组对边平行且相等的四边形是平行四边形;(4)两组对角分别相等的四边形是平行四边形;(5)对角线互相平分的四边形是平行四边形．
Do you think it is difficult to determine the content of the parallelogram and the special parallelogram? Today, I invited you to Mr. Xin and see how he said it. The method for determining the parallelogram is: (1) The parallelograms of the two pairs of opposite sides are parallelograms; (2) The quadrilaterals with the opposite sides of the two sets of parallelograms are parallelograms; (3) A set of parallelograms with opposite sides are parallel and the parallelograms are parallel. Quadrilateral; (4) The quadrilaterals in which the two sets of diagonal angles are equal are parallelograms; (5) The quadrilaterals diagonally bisected each other are parallelograms.