A cylindrical bucket, the inner diameter and height of the bottom surface are both 1 meter, and half a bucket of water is stored in the bucket, how many kilograms does the water weigh? (1 cubic meter of water weighs 1000 kilograms)
一个圆柱形水桶，底面内直径和高都是1米，桶内贮半桶水，这些水重少千克？(1立方米水重1000千克)
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) ** 2</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.14 * (1/4) * (1/2) * 1_000</gadget>
<output>392.5</output>

<result>392.5</result>