If an arc of 45 degrees on circle A has the same length as an arc of 20 degrees on circle B, then what is the ratio of the area of circle A to the area of circle B? Express your answer as a common fraction.
If an arc of 45 degrees on circle A has the same length as an arc of 20 degrees on circle B, then what is the ratio of the area of circle A to the area of circle B? Express your answer as a common fraction.
Circle A: r = 4 arc length = pi
Circle B: 20 / pi = 360 / x x = 18pi radius R = 9
A / B = (42pi) / (92pi) = 16 / 81 
