cone has a base circumference of 18.84 cm and a height of 4 cm. By how many square centimeters is the surface area of the original cone increased by cutting it in half from the apex along the height?
一个圆锥的底面周长是18.84厘米，高是4厘米．从圆锥的顶点沿着高将它切成两半后，表面积比原来的圆锥增加了多少平方厘米？
<gadget id="calculator">18.84 / 3.14</gadget>
<output>6</output>

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

<gadget id="calculator">6 * 2 * 2</gadget>
<output>24</output>

<result>24</result>