A cylindrical bucket is 0.5 meters high and has a bottom radius of 0.2 meters. It is filled with (3/4) bucket of water. How many liters of water are there in the bucket?
一只圆柱形水桶高0.5米，底面半径0.2米，装了(3/4)桶水，桶中有水多少升？
<gadget id="calculator">0.2 * 10</gadget>
<output>2</output>

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

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3.14 * 4 * 0.5 * 10 * (3/4)</gadget>
<output>47.1</output>

<result>47.1</result>