A cylinder with a height of 6 cm, if it is cut in half along the diameter of the bottom surface, the area of the cut surface is 54 square centimeters, what is the radius of the bottom surface of the cylinder in centimeters?
一个高6厘米的圆柱，若沿底面直径把它切成两半，切面的面积是54平方厘米，这个圆柱的底面半径是多少厘米．
<gadget id="calculator">54 / 6 / 2</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>