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（通用版）2019年中考数学总复习第五章基本图形（一）第21讲多边形与平行四边形（讲本）课件.ppt

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A,C,10,C,D,D,8,C,360,【思路方法】与平行四边形性质有关的计算方法： 1.求角度：结合平行四边形性质：对角相等、邻角互补及平行关系，将所求角度进行和差变化转化为已知角求解； 2.求线段长：根据平行四边形性质及已知角关系，转化到同一三角形中，利用勾股定理、直角三角形性质或等腰三角形性质进行求解；根据平行四边形性质，利用平行线分线段成比例(三角形相似)求线段长或线段比值.,B,C,D,D,B,16,4或2,12或20,D,

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