Radius of the circle, r = 21 cm.
Angle at the centre of the circle, θ = 60°
(1) the length of the arc ?
(2) Area of the sector formed by the arc?
(3) Area of the segment.
(1) The length of arc OAPB
= 22 cm
(2) Area of the sector OAPB
(3) Area of the segment APB:
= Area of the sector OAPB – Area of the equilateral ∆OAB