A conical sand pile has a diameter of 5 decimeters at the bottom and 1.5 times its height. What is the volume of the sand pile in cubic decimeters?
一个圆锥形沙堆，底面直径是5分米，是高的1.5倍，这个沙堆的体积是多少立方分米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) ** 2</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">5 / 1.5</gadget>
<output>3.333333</output>

<gadget id="calculator">(1/3) * 3.14 * (25/4) * 3.333333</gadget>
<output>21.805553</output>

<result>21.805553</result>