A cylinder has a base radius of 9 cm and a height of 10 cm. What is the volume of the cylinder in square centimeters?
一个圆柱的底面半径是9厘米，高10厘米，这个圆柱的体积是多少平方厘米？
<gadget id="calculator">9 ** 2</gadget>
<output>81</output>

<gadget id="calculator">3.14 * 81 * 10</gadget>
<output>2_543.4</output>

<result>2_543.4</result>