AD = 24, BC = 12 In ΔBCE & ΔADE since ∠CBA = ∠CDA (Angles by same arc) ∠BCE = ∠DAE (Angles by same arc) ∠BEC = ∠DEA (Opp. angles) ∴ ∠BCE & ∠DAE are similar Δs with sides in the ratio 1 : 2 Ratio of area = 1 : 4 ( i.e square of sides)