Given that the radius of a circle is R, and R satisfies 3: R=R:4, what is the area of the circle?
已知一个圆的半径为R，且R满足3：R=R：4，则这个圆的面积为多少
<gadget id="calculator">3.14 * 12</gadget>
<output>37.68</output>

<result>37.68</result>