There is a cylindrical wooden rod with a radius of 5 cm and a height of 10 cm. After sawing into two equal pieces along the diameter of the bottom, how much will the surface area increase by cm**2.
有一个圆柱形木棒，半径是5cm，高是10cm，沿底面直径锯成相等的两块后，表面积比原来增加多少cm**2．
<gadget id="calculator">5 * 2 * 10 * 2</gadget>
<output>200</output>

<result>200</result>