To build a cylindrical pool with a bottom diameter of 8 meters and a depth of 1.5 meters, at least how many cubic meters of soil must be dug? To plaster its bottom and sides, what is the area to plaster?
要建一个圆柱形的水池，底面直径为8米，深1.5米，至少要挖多少立方米的土？要在它的底面和侧面抹水泥，抹水泥的面积是多大？
<gadget id="calculator">3.14 * 8 * 1.5</gadget>
<output>37.68</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 2</gadget>
<output>100.48</output>

<gadget id="calculator">37.68 + 100.48</gadget>
<output>138.16</output>

<result>138.16</result>