Question 4On circle $O,$ points $C$ and $D$ are on the same side of diameter $\overline{AB},$ $\angle AOC = 30^\circ,$ and $\angle DOB = 45^\circ.$ What is the ratio of the area of the smaller sector $COD$ to the area of the circle? $\dfrac{2}{9}$$\dfrac{1}{4}$$\dfrac{5}{18}$$\dfrac{7}{24}$$\dfrac{3}{10}$
