A cylinder-shaped reservoir has a circumference of 25.12 meters measured from the inside and a depth of 5 meters. Cement is applied to its inner wall and bottom. How much is the area covered with cement?
一个圆柱体形的蓄水池，从里面量底面周长25.12米，深5米，在它的内壁与底面抹上水泥．抹水泥的面积是多少？
<gadget id="calculator">25.12 * 5</gadget>
<output>125.6</output>

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

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">125.6 + 12.56</gadget>
<output>138.16</output>

<result>138.16</result>