Question 7If an arc of $45^\circ$ on circle $A$ has the same length as an arc of $30^\circ$ on circle $B,$ then the ratio of the area of circle $A$ to the area of circle $B$ is$\dfrac{4}{9}$$\dfrac{2}{3}$$\dfrac{5}{6}$$\dfrac{3}{2}$$\dfrac{9}{4}$