Question

Triangle ABC,Shown in the diagram below is an isosceles triangle

Answer 1

Since it's isosceles, ∠ABC = (180-30) / 2 = 75

Answer 2

I hope this helps you


ACB=ABC=180-30/2=75


angle C=angle B


A+B+C=180


2B+30=180



OR



2C+30=180


B=C=75