A cylindrical oil drum without a cover is unfolded to form a square. It is known that the height of this oil drum is 6.28 decimeters. How many liters is the volume of this oil drum?
一个无盖的圆柱形油桶侧面展开后是一个正方形，已知这个油桶的高是6.28分米，这个油桶的容积是多少升？
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 6.28</gadget>
<output>19.7192</output>

<result>19.7192</result>