There is a conical container filled with water, the circumference of the bottom surface is 18.84 cm, and the height is 15 cm. Pour water into a cylindrical container and it is just full. It is known that the height of a cylindrical container is 30 cm, what is the area of the bottom of this cylindrical container in square centimeters?
有一个装满水的圆锥形容器，底面周长是18.84厘米，高15厘米，把水倒入一个圆柱形的容器中，恰好装满．已知圆柱形的容器高30厘米，这个圆柱形容器的底面积是多少平方厘米？
<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3.14 * 9 * 15 * (1/3)</gadget>
<output>141.3</output>

<gadget id="calculator">141.3 / 30</gadget>
<output>4.71</output>

<result>4.71</result>