A cone has a base diameter of 4 cm and a height of 6 cm. Cutting a cone in half from its apex along its height increases the surface area by how many square centimeters.
一个圆锥的底面直径是4厘米，高是6厘米．从圆锥的顶点沿着高将它切成两半，表面积增加多少平方厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">4 * 3 * 2</gadget>
<output>24</output>

<result>24</result>