Cut a cone with a base circumference of 18.84 cm and a height of 8 cm along a diameter into two parts of equal size, how much does the surface area increase in square centimeters?
把一个底面周长18.84厘米，高8厘米的圆锥形沿一条直径剖成大小相等的两个部分表面积增加多少平方厘米．
<gadget id="calculator">18.84 / 3.14</gadget>
<output>6</output>

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

<gadget id="calculator">6 * 4 * 2</gadget>
<output>48</output>

<result>48</result>