Question

the exterior angle and one interior positive angle of a triangle are given here respectively find the other interior positive angle and the third angle of 120 degree and 45 degree​

Answer 1

Answer:

Let us consider a triangle ABC whose side AB is produced to D.

Let /_ A = x and /_C = y.

/_B = 45

/_ACD = 120

using exterior angle property

/_ACD = x + 45

120 = x + 45

x = 75

now, y + /_ACD = 180 (linear pairs)

y + 120 = 180

y = 60