Question

An exterior angle of a triangle is 120and interior opposite angles are in ratio 7:5. Find all the three angles of a triangle.

Answer 1

the angles of the triangle will be

70

50

60

Answer 2

7x+5x=120. Because exterior angle=sum of opposite interior angles.

12x=120

X=10

7x=70

5x=50

Sum of all angles in a triangle=180

70+50+x=180

120+x=180

X=60

The angles of the triangle are 50,60,70.