Take a cylindrical wood with a height of 50 cm, cut it into two equal half cylinders along the bottom diameter, and the area of each cut surface is 200 square centimeters, then how many square centimeters is the side area of the original cylinder?
把一个高是50厘米的圆柱形木料，沿底直径把它切成两个相等的半圆柱，每个切面的面积是200平方厘米，那么原来圆柱体的侧面积是多少平方厘米？
<gadget id="calculator">200 / 50</gadget>
<output>4</output>

<gadget id="calculator">4 * 3.14 * 50</gadget>
<output>628</output>

<result>628</result>