A cone has a base circumference of 25.12 cm and a height of 6 cm. When the cone is cut in half from the apex along the height, the sum of the surface areas is increased by the number of square centimeters compared to the surface area of the cone.
一个圆锥的底面周长是25.12厘米，高是6厘米．从圆锥的顶点沿着高将它切成两半后，表面积之和比圆锥的表面积增加了多少平方厘米．
<gadget id="calculator">25.12 / 3.14</gadget>
<output>8</output>

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

<gadget id="calculator">8 * 3 * 2</gadget>
<output>48</output>

<result>48</result>