The inner wall and the bottom of a cylindrical pool should be plastered with cement. The diameter of the bottom of the pool is 4 meters, and the depth of the pool is 1.5 meters. How many square meters is the area covered with cement?
一个圆柱形水池的内壁和底面都要抹上水泥，水池底面直径是4米，水池深1.5米．抹水泥的面积是多少平方米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

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

<gadget id="calculator">3.14 * 4 * 1.5</gadget>
<output>18.84</output>

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

<result>31.4</result>