Consider ΔABD such that ∠ADB = 20° and C is a point on BD such that AB = AC and CD = CA. Then the measure of ∠ABC is :
∠ABD = 20°
So , ∠CAD = 20°
∠ACD = 180° - 40° = 140°
∠ACB = 180° - 140° = 40 °
∠ABC = ∠ACB = 40°
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