人教版六年级上册数学 《扇形》PPT课件

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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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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
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