A conical sand pile has a bottom circumference of 6.28m and a height of 1.5m. What is its volume in m**3.
一个圆锥形沙堆，底面周长是6.28m，高1.5m，它的体积是多少m**3．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">(1/3) * 3.14 * 1 * 1.5</gadget>
<output>1.57</output>

<result>1.57</result>