A straight conical sand pile has a diameter of 2 meters at the bottom and a height of 1.5 meters. How many cubic meters is this pile of sand?
一个直圆锥形砂堆，底面直径2米，高1.5米，这堆砂子有多少立方米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 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>