Question

∠ACD is an exterior angle of ∆ABC. If m∠A=80°and m∠ACD = 140°,thenfind the m∠B.

Answer 1

Answer:

An exterior angle of a triangle is equal to the sum of the opposite interior angles.

Hence, In this case ∠A and ∠B

So,

∠A+∠B=140

∘

as ∠A=∠B

or,2∠A=140

∘

∠A=∠B=70

∘

Step-by-step explanation:

please mark me brainlist