If a cylinder with a base circumference of 9.42 decimeters and a height of 6 decimeters is cut into two half cylinders along the diameter of the base, how many square decimeters will the total surface area increase?
把一个底面周长是9.42分米，高6分米的圆柱，沿底面直径切成两个半圆柱后，表面积共增加了多少平方分米．
<gadget id="calculator">9.42 / 3.14</gadget>
<output>3</output>

<gadget id="calculator">3 * 6 * 2</gadget>
<output>36</output>

<result>36</result>