A cylinder with a height of 8 cm and a base radius of 5 cm is now cut perpendicularly along its diameter. How much does the surface area increase?
一个圆柱高8cm，底面半径5cm，现在沿着它的直径垂直切开，表面积增加了多少．
<gadget id="calculator">5 * 2 * 8 * 2</gadget>
<output>160</output>

<result>160</result>