A cylindrical bucket has a diameter of 4 decimeters measured from the inside and a height of 4 decimeters. How many kilograms can this bucket hold? (Weighs 1 kg per liter of water)
一个圆柱形水桶，从里面量底面直径是4分米，高4分米．这个水桶能装多少千克？(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 * 4 * 1</gadget>
<output>50.24</output>

<result>50.24</result>