<P> Substituting in the circumference </P> <Dl> <Dd> L 2 π r = θ 2 π, (\ displaystyle (\ frac (L) (2 \ pi r)) = (\ frac (\ theta) (2 \ pi)),) </Dd> </Dl> <Dd> L 2 π r = θ 2 π, (\ displaystyle (\ frac (L) (2 \ pi r)) = (\ frac (\ theta) (2 \ pi)),) </Dd> <P> and, with α being the same angle measured in degrees, since θ = α / 180 π, the arc length equals </P>

How many degrees of arc are in a circle