The circumference of the base of a cylinder is 31.4 cm. If the height increases by 2 cm and the size of the base remains the same, how many square centimeters does the surface area increase?
一个圆柱体底面周长是31.4厘米，如果高增加2厘米，底面大小不变，那么表面积增加多少平方厘米．
<gadget id="calculator">31.4 * 2</gadget>
<output>62.8</output>

<result>62.8</result>