There is a cylindrical wooden rod with a radius of 2 cm and a height of 20 cm. After sawing into two equal pieces along the diameter of the bottom surface, how many square centimeters square centimeters will the surface area increase from the original?
有一个圆柱木棒，半径是2厘米，高是20厘米，沿底面直径锯成相等的两块后，表面积比原来增加多少平方厘米平方厘米？
<gadget id="calculator">2 * 2 * 20 * 2</gadget>
<output>160</output>

<result>160</result>