Question

If in a Δ ABC , AB + BC +AC=11.3cm, ∠B= 70° , ∠C= 60° then to draw the triangle what should me the measure of remote interior angles to ∠B and ∠C ? *​

Answer 1

Answer:

ANSWER

The exterior angle is the sum of the interior opposite angles. Since AB=AC, ∠ABC=∠ACB. 

Since the sum of angles in a triangle is 180∘, ∠BAC=100∘

Hence, external angle at B = ∠ACB+∠BAC=100∘+40∘=140∘