A cylindrical swimming pool has a bottom diameter of 20 meters and a depth of 3 meters. Ceramic tiles are pasted on the bottom and sides of the swimming pool. If 50 tiles are used per square meter, how many tiles will be used?
一个圆柱形游泳池底面直径20米，深3米，在游泳池底部和侧面贴上瓷砖，如果每平方米用瓷砖50块，大约要用瓷砖多少块？
<gadget id="calculator">3.14 * 20 * 3</gadget>
<output>188.4</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">188.4 + 314</gadget>
<output>502.4</output>

<gadget id="calculator">502.4 * 50</gadget>
<output>25_120</output>

<result>25_120</result>