If a cylinder with a base diameter of 3 cm and a height of 6 cm is cut into two half cylinders along the base diameter, how many square centimeters will the total surface area increase?
把一个底面直径为3厘米，高为6厘米的圆柱体，沿底面直径切割成两个半圆柱后表面积共增加了多少平方厘米．
<gadget id="calculator">6 * 3 * 2</gadget>
<output>36</output>

<result>36</result>