A cone has a base circumference of 12.56 meters and a height of 8 meters. If it is cut into two equal halves from the apex along the height, how many square meters will the surface area increase?
一个圆锥的底面周长是12.56米，高8米，从顶点沿高把它切成相等的两半，表面积增加了多少平方米．
<gadget id="calculator">12.56 / 3.14</gadget>
<output>4</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 4 * 2</gadget>
<output>32</output>

<result>32</result>