The side of a cylinder is unfolded into a square, its base area is known to be 5cm**2, what is its surface area in cm**2.
一个圆柱体的侧面展开后为正方形，已知它的底面积是5cm**2，它的表面积是多少cm**2．
<gadget id="calculator">3.14 * 20</gadget>
<output>62.8</output>

<gadget id="calculator">62.8 + 10</gadget>
<output>72.8</output>

<result>72.8</result>