A cylinder has a base radius and a height of 5 cm. If the height is doubled, how many square centimeters will the surface area increase?
一个圆柱体，底面半径与高都为5cm，如果高增加一倍，那么表面积增加多少平方厘米？
<gadget id="calculator">2 * 3.14 * 5 * 5</gadget>
<output>157</output>

<result>157</result>