<Dl> <Dd> S = r θ (\ displaystyle S = r \ theta) </Dd> </Dl> <Dd> S = r θ (\ displaystyle S = r \ theta) </Dd> <P> where, S represents the arc length, r represents the radius of the circle and θ represents the angle in radians made by the arc at the centre of the circle . </P> <P> If the value of angle is given in degrees, then we can also use the following formula: </P>

Sector area is a fraction of a circles what