Answer :

Given, ∠A = 70° and ∠B = 40°

In a triangle ABC,

The measure of an exterior angle of a triangle is equal to the sum of its remote interior angles

∠ACD is an exterior angle of triangle ABC

So, from theorem of remote interior angles,

∠ACD = ∠BAC + ∠ABC

⇒ ∠ACD = ∠A + ∠B

⇒ ∠ACD = 70° + 40° = 110°

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