球缺是指球体被平面截去的一部分。截面称为球缺的底面,垂直于截面的直径被此截面截得的线段长称为球缺的高。
![h为高,r为底面半径,R为球半径](http://upload.wikimedia.org/wikipedia/commons/1/17/%E7%90%83%E5%86%A0%E6%88%96%E7%90%83%E7%BC%BA.jpg)
球缺的表面积:(R是球体的半径,h是球缺的高,r是球缺的底面半径)
球缺的体积:或(R是球体的半径,h是球缺的高,r是底面半径)
与球冠区别:球缺是体,而球冠是面,故球冠只能计算表面积。
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