Question

3. An exterior angle of a triangle
measures 120° and it's interior
opposite angles are in the ratio 5:7.
Find the measure of these two
interior angles.​

Answer 1

Answer:

The exterior angle 120 degrees means the supplementing interior angle is 60 degrees.

Let the other two interior angles be some 5x and 7x degrees.

60%2B5x%2B7x=180

 

-

12x=180-60

12x=120

x=10

This says that the other two angles are 50 degrees and 70 degrees.