A cylindrical petrol tank has a bottom diameter of 8 decimeters and a height of 5 decimeters. Now it is full of gasoline, if each liter of gasoline weighs 0.85 kilograms, how many kilograms of gasoline is in this barrel?
一个圆柱形的汽油桶底面直径是8分米，高5分米．现装满汽油，如果每升汽油重0.85千克，这个油桶的汽油共多少千克？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 5 * 0.85</gadget>
<output>213.52</output>

<result>213.52</result>