A cylindrical cistern has a diameter of 8 meters measured from the inside and a depth of 5 meters. How many square meters is the area where cement should be plastered on the bottom and surroundings of this pool?
一个圆柱形蓄水池，从里面量底面直径是8米，深5米．要在这个水池的底面和四周抹上水泥，抹水泥的面积是多少平方米？
<gadget id="calculator">3.14 * 8 * 5</gadget>
<output>125.6</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</gadget>
<output>50.24</output>

<gadget id="calculator">125.6 + 50.24</gadget>
<output>175.84</output>

<result>175.84</result>