If the sides of a cylinder are expanded to form a square, and the radius of the circle at the base of the cylinder is 3 cm, what is the volume of the cylinder in cubic centimeters?
一个圆柱的侧面展开得到一个正方形，圆柱的底面圆的半径是3cm，这个圆柱体体积是多少立方厘米．
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">2 * 3.14 * 3</gadget>
<output>18.84</output>

<gadget id="calculator">28.26 * 18.84</gadget>
<output>532.4184</output>

<result>532.4184</result>