If a cone has a base diameter of 12 cm and a height of 3 cm, if it is cut into two halves with the same shape, how many square centimeters will the surface area increase?
一个圆锥，底面直径12厘米，高3厘米，把它一刀切开，成为形状相同的两半，表面积增加多少平方厘米？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">12 * (3/2) * 2</gadget>
<output>36</output>

<result>36</result>