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# 4.1.1 立体图形与平面图形 PowerPoint PPT Presentation

4.1.1 立体图形与平面图形. “ 几何”学的主要研究对象：. 图形的形状、大小和位置关系. 你能说出下列图形的名字吗？. 三角形. 五边形. 平行四边形. 正方形. 梯形. 八边形. 圆. 椭圆. 圆环. 五角星. 几何图形的各部分都在同一平内，这样的几何图形叫做平面图形. 观察下列图形，从中找出你熟悉的几何图形：. 从实物中抽象出来的各种图形统称为几何图形. 你识这些图形吗？. 长方体. 正方体. 圆柱体. 棱柱. 棱锥体. 球体. 圆锥体. 圆台. 它们有什么特征？. 　　几何图形的 各部分不都在同 一平面内，我们

4.1.1 立体图形与平面图形

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