A cylindrical water cellar has a bottom diameter of 2 meters and a depth of 2 meters. A layer of cement is to be applied to the sides and bottom of the cellar. How many square meters is the cement-coated area?
一个圆柱形水窖，底面直径2米，深2米，要在窖内的侧面和底面涂一层水泥，涂水泥的面积有多少平方米？
<gadget id="calculator">3.14 * 2 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">12.56 + 3.14</gadget>
<output>15.7</output>

<result>15.7</result>