If the circumference of the base of a cone is 15.7 cm and the height is 4 cm, what is its volume in cubic centimeters?
一个圆锥的底面周长是15.7厘米，高是4厘米，它的体积是多少立方厘米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">15.7 / 3.14 / 2</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 ** 2</gadget>
<output>6.25</output>

<gadget id="calculator">(1/3) * 3.14 * 6.25 * 4</gadget>
<output>26.166667</output>

<result>26.166667</result>