人教版六年级数学上册《扇形》PPT课件下载

二、自主学习 探究新 知
以半圆为弧的扇形的圆心角是多少度？
以
1 4
圆为弧的扇形呢？
以半圆为弧的扇形的圆心 角是180°。
二、自主学习 探究新 知
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三、巩固提高
2、画一个半径是2厘米的圆，再在圆中画一个圆心角是100°的扇形。
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在同一个圆中，扇形的大 小与什么有关系呢？
我发现在同一个圆中，扇形 的大小与这个扇形的圆心角 的大小有关。
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人教版小学数学六年级上册
第五单元 圆
5.6 扇 形
MENTAL HEALTH COUNSELING PPT
桃李课堂
一、创设情来自百度文库 明确目 标
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100°
四、课堂小结
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二、自主学习 探究新 知
A
图上A、B两点之间的部分叫做
弧，读作“弧AB”。
弧 O 圆心角
一条弧和经过这条弧两端的两 条半径所围成的图形叫做扇形。
B
顶点在圆心的角叫做圆心角。
二、自主学习 探究新 知
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360× 14＝90(度)
三、巩固提高
1、 指出下列物体中的扇形。
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