Question: what is the formula for perimeter of a segment?
Answer: The perimeter of the major segment = 2r[sin Ɵ+ π- πƟ/180]. Case 4: If the radius of the circle = r and the chord is at a distance = d from the centre of the circle; then the perimeter of the minor segment = 2√(r^2-d^2)+(2πr/180)*arc cos (d/r).