A cylindrical reservoir, measured from the inside, has a perimeter of 25.12 meters and a depth of 2.4 meters. The water surface in the pool is 0.8 meters away from the bottom. How many tons of water are there in the reservoir? (1 cubic meter of water weighs 1 ton)
一个圆柱形的蓄水池，从里面量，底面的周长是25.12米，深2.4米，池内水面距底面0.8米．蓄水池内现有水多少吨？(1立方米的水重1吨)
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 0.8 * 1</gadget>
<output>40.192</output>

<result>40.192</result>