Cut a conical iron block with a base diameter of 12 cm and a height of 9 cm from the middle, and divide it into two identical small iron blocks.
把一个底面直径为12厘米，高为9厘米的圆锥形铁块从中间切开，分成两个完全一样的小铁块，表面积比原来增加了多少平方厘米．
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">12 * (9/2) * 2</gadget>
<output>108</output>

<result>108</result>