A cylinder has a base radius of 4 cm and a height of 25 cm. What is the surface area of the cylinder?
一个圆柱的底面半径是4厘米，高是25厘米，这个圆柱的表面积是多少．
<gadget id="calculator">3.14 * 4 * 2 * 25</gadget>
<output>628</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 2</gadget>
<output>100.48</output>

<gadget id="calculator">628 + 100.48</gadget>
<output>728.48</output>

<result>728.48</result>