cylindrical pool has a base radius of 2 meters and a height of 1.5 meters. Put cement around and on the bottom of the pool, what is the area of the cement?
一个圆柱形水池，底面半径是2米，高是1.5米．在池内周围和底面抹上水泥，抹水泥的面积是多少？
<gadget id="calculator">2 * 3.14 * 2 * 1.5</gadget>
<output>18.84</output>

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

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

<gadget id="calculator">18.84 + 12.56</gadget>
<output>31.4</output>

<result>31.4</result>