A cylindrical oil barrel has a bottom diameter of 6 decimeters and a height of 70 cm. How many liters of oil can this oil barrel hold?
一个圆柱油桶的底面直径是6分米，高70厘米，这个油桶可装油多少升．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">70 / 10</gadget>
<output>7</output>

<gadget id="calculator">3.14 * 9 * 7</gadget>
<output>197.82</output>

<result>197.82</result>