2019届九年级数学上册第五章投影与视图5.2视图(第3课时)课件(新版)北师大版.ppt

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第三课时,由三种视图描述几何体的“三步法”: (1)由图想体根据三视图想象从三个方向看到的几何体的形状. (2)综合判断根据三视图反映的几何体三个方向的空间特征,初步确定几何体的形状. (3)认定形状根据“长对正,高平齐,宽相等”确定轮廓线位置.,1,2,3,4,5,1.(2017湖北黄冈中考)如图是一几何体的三种视图,则该几何体的名称为( )A.长方体 B.正三棱柱 C.圆锥 D.圆柱,答案,1,2,3,4,5,2.(2017山东滨州中考)如图是一个几何体的三种视图,则这个几何体是( ),答案,1,2,3,4,5,3.某商品的外包装盒的三种视图如图,则这个包装盒的体积是( )A.200 cm3 B.500 cm3 C.1 000 cm3 D.2 000 cm3,答案,1,2,3,4,5,4.如果一个立体图形的主视图为矩形,那么这个立体图形可能是 .(只需填上一个立体图形),答案,1,2,3,4,5,5.已知一个几何体的三种视图如图,那么该几何体的形状是 ,表面积是 cm2.,答案,

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