Cut out a sector with a radius of 10 cm from paper to make the side of a cone. The diameter of the base of the cone is 5 cm. Find the surface area of the cone.
从纸上剪下一个半径是10厘米的扇形做一个圆锥的侧面，圆锥的底面直径是5厘米，求圆锥体的表面积．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">5 * 3.14</gadget>
<output>15.7</output>

<gadget id="calculator">2 * 10 * 3.14</gadget>
<output>62.8</output>

<gadget id="calculator">15.7 / 62.8</gadget>
<output>0.25</output>

<gadget id="calculator">0.25 * 360</gadget>
<output>90</output>

<gadget id="calculator">90 / 360</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.14 * 100 * (1/4)</gadget>
<output>78.5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) ** 2</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">3.14 * (25/4)</gadget>
<output>19.625</output>

<gadget id="calculator">78.5 + 19.625</gadget>
<output>98.125</output>

<result>98.125</result>