Question

what is the value of y, if 3y, 4y,and 5y are the exterior angles of a triangle?

Answer 1

What is always the sum of the exterior angles of a triangle?

Answer 2

an exterior angle is equal to sum of two interior angles

Answer 3

Yes, but what is the sum of ALL 3 exterior angles? It always equals a specific number. Maybe draw a few triangles to convince yourself of this? Once you discover this fact, the rest of the problem is easy.

Answer 4

OK...thank you

Answer 5

360 =D

Answer 6

Exterior angle always add to 360

Answer 7

3y + 4y + 5y = 360

12y = 360

y = 360 / 12

y = 30