3.8 圆锥的认识-2020-2021学年六年级下册数学【名校培优课堂】同步教学课件（人教版）

第8课时 圆锥的认识 圆柱与圆锥 3 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 优翼文化 二 探究新知 上面这些物体的形状有什么共同的特点？ 优翼文化 二 探究新知 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 这些物体的形状都是圆锥体，简称圆锥。 二 探究新知 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 你还见过哪些圆锥形的物体？ 二 探究新知 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 拿一个圆锥形的物体，观察它有哪些特征。 顶点 底面 圆锥的底面是个圆。 1 二 探究新知 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 侧面 圆锥的侧面是曲面，展开后是一个扇形。 二 探究新知 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com O h r 高 从圆锥的顶点到底面圆心的距离是圆锥的高。 圆锥只有一条高。 二 探究新知 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 怎样测量圆锥的高？ 讨论 1.测量时，圆锥的底面要水平地放； 2.上面的平板要水平放在圆锥的顶 点上面； 3.测量。 二 探究新知 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 动手做一做 转动起来像一个圆锥。 如下图所示，把一张直角三角形的硬纸贴在木棒 上，快速转动木棒，看看转出来的是什么形状。 三 对应练习 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 侧面 指出下面圆锥的底面、侧面和高。 底 面 侧面 底面 侧面 底面 高 高 高 做一做 优翼 四 巩固练习 www.youyi100.com www.youyi100.com www.youyi100.co