cylindrical oil storage tank, the radius of the bottom surface measured from the inside is 2 meters, and the current storage oil is 4710 liters, which is exactly 25% of the volume of the oil tank. What is the height of the oil tank in meters?
一只圆柱形贮油桶，从里面量底面半径是2米，现贮油4710升，正好占油桶容积的25%，油桶的高是多少米？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">4.71 / (1/4) / 12.56</gadget>
<output>1.5</output>

<result>1.5</result>