Question

Find:
question: b, if b -3a = 40⁰​

Answer 1

Step-by-step explanation:

In a △ABC, by angle sum property, sum of angles of a triangle is 180∘

∴∠ABC+∠BCA+∠CAB=180∘

Given : ∠A=∠CAB=55∘

and ∠B=∠ABC=40∘.

∴55∘+40∘+∠BCA=180∘

∴∠BCA=180∘−95∘ =85∘.

Therefore, ∠BCA=∠C=85o.