If a cylinder whose base area has a radius of 4 cm is cut into two cylinders of the same size, what is the increase in surface area in square centimetres?
把一个底面积半径是4厘米的圆柱，切成两个同样大小的圆柱，表面积增加了多少平方厘米．
<gadget id="calculator">3.14 * 4 * 4 * 2</gadget>
<output>100.48</output>

<result>100.48</result>