2019年中考数学总复习第五单元四边形第23课时多边形与平行四边形课件湘教版201901151117.pptx

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UNIT FIVE,第五单元 四边形,第 23 课时 多边形与平行四边形,考点一 多边形及其性质,考点聚焦,首尾顺次,360,相等,相等,考点二 平行四边形的定义与性质,相等,平分,考点三 平行四边形的判定,对点演练,题组一 教材题,C,C,12,90,题组二 易错题,【失分点】不能正确理解多边形的内、外角和;解答平行四边形的无图题时,缺乏分类讨论思想;理不清平行四边形判定的依据.,C,D,C,B,探究一 多边形的内角和与外角和,【命题角度】 (1)多边形内角和与边数的互逆求解; (2)已知多边形内角和与外角和的关系求边数.,1260,140,40,8,12,4,针对训练,D,C,探究二 平行四边形的性质,【命题角度】 (1)证明平行四边形中的三角形全等或线段相等; (2)计算角度、线段长或三角形的周长; (3)求对角线长或边长的取值范围.,图23-2,针对训练,探究三 平行四边形的判定,【命题角度】 (1)根据条件判定一个四边形是平行四边形; (2)添加条件,使四边形为平行四边形; (3)以平行四边形为基础,给出正确的结论并证明.,针对训练,C,

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