Question

what is measure of angle D (exterior) ​

Answer 1

Answer:

The exterior angle d equals the angles a plus b.

Step-by-step explanation:

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  

∘