2 Points
Which is the best definition of an exterior angle of a triangle?
O
A. An angle that is complementary to one of the interior angles o
triangle
O
B. An angle that is formed by two segments that are not sides of
triangle
O
C. An angle that forms a linear pair with one of the interior angle
the triangle
O
D. An angle that is formed by two segments that are sides of the

"An angle that forms a linear pair with one of the interior angle the triangle" is the best definition of an exterior angle of a triangle.

Option: C

Explanation:

When to the sum of the inward angles opposite outer angle of a triangle the sum of the inward angles opposite is equivalent thus understood as exterior angle of a triangle.

The Triangle outer angle theorem for more about is if at each vertex the equivalent angle is drawn, the outer angles always add up to 360°. In reality, this is valid for any convex polygon, not just triangles.

In the most easiest pattern , since any angle of triangle equivalent is 60′, the outer angle would be 120′. Therefore all exterior angles sum is:

                     120 + 120 + 120 = 360°.

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