If a cylinder with a radius of 8 cm and a height of 10 cm is cut vertically along the diameter of its base, how many square centimeters will the surface area increase?
把一个半径为8厘米，高为10厘米的圆柱沿着它的底面直径垂直切开，表面积增加了多少平方厘米．
<gadget id="calculator">8 * 2 * 10 * 2</gadget>
<output>320</output>

<result>320</result>