檢視扇形的原始碼

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|<center><img src=https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fpic.51yuansu.com%2Fpic3%2Fcover%2F01%2F41%2F59%2F59275ebd05253_610.jpg&refer=http%3A%2F%2Fpic.51yuansu.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1655674552&t=30eb63bc87018451cd918af4d20d1c86 width="300"></center>
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中文名；扇形

外文名；Sector

扇形面积公式；S=(l·r)/2

扇形公式说明；S是面积,l为扇形弧长,

r为半径,α为弧度制下的扇形圆心角.

扇形周长公式；C=(α+2)·r

扇形弧长公式；l=αr

扇形圆心角；α=l/r
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一条圆弧和经过这条圆弧两端的两条半径所围成的图形叫'''扇形'''（半圆与直径的组合也是扇形）。显然， 它是由圆周的一部分与它所对应的[[圆心角]]围成。《[[几何原本]]》中这样定义扇形：由顶点在圆心的角的两边和这两边所截一段圆弧围成的图形。<ref>[https://wenku.so.com/d/ad89bc03c018e154049a05c6a5038395 扇形的认识 ],360文库 , 2018年10月28日</ref>