If a cylinder with a base radius of 3 cm and a height of 5 cm is cut along the base diameter, how many square centimeters will the surface area increase?
把一个底面半径是3厘米，高是5厘米的圆柱沿底面直径切开，表面积增加了多少平方厘米？
<gadget id="calculator">3 * 2 * 5 * 2</gadget>
<output>60</output>

<result>60</result>