A cylindrical pool has a diameter of 8 meters measured from the inside and a depth of 4 meters. Put cement on the bottom and surroundings of this pool. What is the area of the cemented part in square meters?
一个圆柱形水池，从里面量得底面直径是8米，深是4米．在这个水池的底面和四周抹上水泥，抹水泥部分的面积是多少平方米？
<gadget id="calculator">3.14 * 8 * 4</gadget>
<output>100.48</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">100.48 + 50.24</gadget>
<output>150.72</output>

<result>150.72</result>