Answer:
False
Step-by-step explanation:
The exterior angles of a triangle are formed by one side and its extension.
The value of an exterior angle of a triangle is equal to the sum of the two non-adjacent interiors. An interior and exterior angle of a triangle are supplementary, in another words, their total is 180º.
For example, from the picture:
\(\beta=180-B\\\alpha=180-A\\\gamma=180-C\)
