A cylindrical cistern is built on the construction site with a bottom diameter of 5 meters and a height of 2 meters. Put cement on the four walls and bottom of the pool, find the area of the cement.
工地修一个圆柱形的蓄水池，底面直径5米，高2米，在池的四壁和底面抹上水泥，求抹水泥的面积．
<gadget id="calculator">3.14 * 5 * 2</gadget>
<output>31.4</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) ** 2</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">3.14 * (25/4)</gadget>
<output>19.625</output>

<gadget id="calculator">31.4 + 19.625</gadget>
<output>51.025</output>

<result>51.025</result>