What is the volume of a cone whose base diameter is 10 decimeters and height is 9 decimeters?
一个圆锥的底面直径是10分米，高是9分米，它的体积是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * 9</gadget>
<output>235.5</output>

<result>235.5</result>