A cylindrical bucket with a base diameter of 4 decimeters and a height of 7 decimeters. How many kilograms of water can this bucket hold? (Weighs 1 kg per liter of water)
一个底面直径为4分米的圆柱形水桶，高7分米．这个水桶能装水多少千克？(每升水重1千克)
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 7 * 1</gadget>
<output>87.92</output>

<result>87.92</result>