A conical grain pile measures 12.56 meters in circumference at the bottom and 3 meters in height. For example, based on the calculation of 0.7 tons per cubic meter of grain, how many tons does this pile of grain weigh?
一圆锥形粮堆，量得底面周长12.56米，高3米．如按每立方米粮食重0.7吨计算，这堆粮食重多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">(1/3) * 3.14 * 4 * 3 * 0.7</gadget>
<output>8.792</output>

<result>8.792</result>