The diameter of the base of a cylinder is 10 cm and the height is 20 cm, find the surface area.
圆柱底面直径10厘米，高20厘米，求表面积．
<gadget id="calculator">3.14 * 10 * 20</gadget>
<output>628</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 2</gadget>
<output>157</output>

<gadget id="calculator">628 + 157</gadget>
<output>785</output>

<result>785</result>