Question

Given: △ABC, m∠A=60°, m∠C=45°, AB=9 Find: Perimeter of △ABC, Area of △ABC

Answer 1

By angle sum property
The sum of angles of a triangle =180 degree
According to the question
Angle A + angle B +Angle c = 180
60 degree +angle B + 45degree =180
Angle B = 180- 105
75 degree