The diameter of the bottom surface of a cone is 10cm, and the height is 12cm. If the cone is cut along the height from the apex of the cone, the sum of the surface areas of the two figures obtained is compared with that of the cone. How much does the surface area increase in cm**2.
一个圆锥的底面直径是10cm，高是12cm，从圆锥的顶点沿着高切开，得到的两个图形的表面积之和与圆锥相比，表面积增加多少cm**2．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">10 * 6 * 2</gadget>
<output>120</output>

<result>120</result>