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平行四边形的主要内容是平行四边形的性质和判定,而判定平行四边形常有三种思路:从对边考虑有:两组对边分别平行的四边形是平行四边形,两组对边分别相等的四边形是平行四边形,一组对边平行且相等的四边形是平行四边形;从对角考虑有:两组对角分别相等的四边形是平行四边形;从对角线考虑有:对角线互相平分的四边形是平行四边形;如果把这些条
The main content of the parallelogram is the nature and determination of the parallelogram. There are three ways to determine the parallelogram: From the opposite side, it is considered that the two parallel sides of the two sets of parallelograms are parallelograms, and the two sets of parallel sides are parallel. Quadrilateral, a group of parallel and equal quadrilateral sides is a parallelogram; from diagonal considerations: the two groups of equal diagonal quadrilaterals are parallelograms; from the perspective of diagonals, the quadrilaterals diagonally bisecting each other are parallelograms. If you put these bars