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what is the value of y, if 3y, 4y,and 5y are the exterior angles of a triangle?
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What is always the sum of the exterior angles of a triangle?
an exterior angle is equal to sum of two interior angles
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.
OK...thank you
360 =D
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Exterior angle always add to 360
3y + 4y + 5y = 360 12y = 360 y = 360 / 12 y = 30
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