下标公式

例句：

1. 1. The formula for calculating the area of a circle is πr².
   计算圆面积的公式是πr²。
2. 2. The standard formula for solving this problem is to divide by 2.
   解决这个问题的标准公式是除以2。
3. 3. The formula for finding the volume of a cylinder is V=πr²h, where V is the volume and r is the radius and h is the height.
   求圆柱体积的公式是V=πr²h，其中V是体积，r是半径，h是高。