Let r1 and r2 be the radii of the two circles and let their arcs of same length S subtend angles of 65° and 110° at their centres. Angle subtended at the centre of the first circle,
θ1 = 65°= (65x π/180)° = (13π/36)°
∴ S=r1θ1= r1 (13π/36) ...(i)
Angle subtended at the centre of the second circle,