A cylindrical cistern has a bottom radius of 10 meters, a water depth of 4.5 meters, and a water surface 50 cm from the mouth of the cistern. What is the volume of the cistern in cubic meters?
一个圆柱形蓄水池的底面半径是10米，水深是4.5米，水面距离池口50厘米，这个蓄水池的容积是多少立方米．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4.5 + (1/2)</gadget>
<output>5</output>

<gadget id="calculator">3 * 100 * 5</gadget>
<output>1_500</output>

<result>1_500</result>