A cylinder has a base radius of 5 cm and a height of 80 cm, find its surface area.
有一个圆柱体，底面半径是5厘米，高是80厘米，求它的表面积．
<gadget id="calculator">2 * 3.14 * 5 * 80</gadget>
<output>2_512</output>

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

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

<gadget id="calculator">2_512 + 157</gadget>
<output>2_669</output>

<result>2_669</result>