Question

in a triangle ABC, angle A = y degree and angle B =80 degree and angle C = 20 degree , find angle A

Answer 1

Answer:

a=80°

Step-by-step explanation:

a+b+c=180°

a+80+20=180°

a=180-100

a=80°

Answer 2

80+20+a=180

a = 180-100=80

ab=dc

80x80=20xd

d = (80x80)/20

d = 320