Question

in triangle ABC, BC is priduced to point D. if triangle ABC = 40° and angle ACD=120° then find angle A

Answer 1

angle A will be 80° I hope this will help you

Answer 2

A+B+c  = 180    (angle sum property) Given that B=40 and c = 120 Than,   A = 180-120-40=  20 Hence angle A=20