A cylinder and a cone with the same volume and height, when the circumference of the base of the cylinder is 18.84m, what is the area of the base of the cone in m**2.
体积和高都相等的圆柱和圆锥，当圆柱的底面周长是18.84m时，圆锥的底面积是多少m**2．
<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

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

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

<gadget id="calculator">28.26 * 3</gadget>
<output>84.78</output>

<result>84.78</result>