math/概念/角.md
2022-09-08 21:46:32 +08:00

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# 角
$$ \angle 0^\circ 零角 \lt 锐角 \lt \angle 90^\circ 直角 \lt 钝角 \lt \angle 180^\circ 平角 \lt \angle360^\circ 周角 $$
量取角度的要点:
1. 中心对准顶点
2. 0度对准一边
3. 仔细读数
三角形内角和是180度
四边形内角和是360度
五边形内角和是540度
...
十二边形内角和是1800度