A) in ∆ ABC value of x
sum of the all three angles of a triangle is 180°
so angle A +B+C = 180°
let's place the values of a,b, c
x-5 +3x+30+35 = 180°
4x = 180-65+5
4x= 180-60
4x=120, x= 120/4= 30
x= 30°
B) values of angles A and B
angle B = 3x+30, 3*30+30= 90+30= 120°
angle A = x- 5, 30-5= 25°
