A 45 degree arc of circle D has the same length as a 30 degree arc of circle E what is the ratio of the radius of circle D to the radius of  circle E ?

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The arc length=r.q(q is the angle in radian) 45 degree=pi/4 30 degree=pi/6 rxpi/4=Rpi/6 r(circleD)/r(circleE)=4/6=2/3