The inner bottom of the cylindrical reservoir has a radius of 10m and a height of 3m. Paste ceramic tiles around it and on the bottom surface, how many m**2 are there in total on the surface of the tiles?
圆柱形蓄水池内部底面半径10m，高3m．在它的四周和底面贴上瓷砖，瓷砖面共有多少m**2．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

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

<gadget id="calculator">3.14 * 10 * 2 * 3</gadget>
<output>188.4</output>

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

<result>502.4</result>