Question

the sum of the two angles of a traingle 80°anf their difference is 20° find all angles of a traingle​

Answer 1

Let two angles be x and y.

x + y = 80

x - y =20 ===》x = y + 20 (substitute in abive eqution.)

(y + 20) + y = 80

2y + 20 = 80

y = 30

x = y + 20 = 30 + 20 = 50

x = 50

The third angle = 180 - (50+30) = 100.