In the given figure, ∠ ACD is an exterior angle of ∆ ABC. ∠ B = 40°, ∠ A = 70°.

Question 1:

In the given figure, ∠$$ACD is an exterior angle of ∆$$ABC. ∠$$B = 40°, ∠$$A = 70°.

Find the measure of ∠$$ACD.
 

ANSWER:

In ∆$$ABC,
∠ACD = ∠A + ∠B   (Exterior angle property)
= 70∘ + 40∘          
= 110∘
Hence, the measure of  ∠$$ACD is 110∘​.