To build a cylindrical pool. The bottom is 4 meters in diameter and 1.8 meters deep. What is the minimum square meter area to paint its bottom and sides?
要建一个圆柱形状的水池．底面直径4米，深1.8米．要粉刷它的底面和侧面，粉刷面积至少是多少平方米？
<gadget id="calculator">3.14 * 4 * 1.8</gadget>
<output>22.608</output>

<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">22.608 + 12.56</gadget>
<output>35.168</output>

<result>35.168</result>