Question

solve the question given

Answer 1

We know that the sum of all three sides of a Δ is always 180°

Let the first angle be x and second angle be y.

x+y+65°=180° --------- 1

x-y=20

x = y+20 ----------- 2

Now Subsitute eq 1 into 2

y+20°+y+65°=180°

2y+85° = 180°

2y = 180°-85° = 95°

y = 95/2 = 47.5

x = y + 20°

x= 47.5+20 = 67.5°

Hence, first angle = x = 67.5°

Second angle = y = 47.5°

third angle = 65°(given)