With a protractor remembering that interior angle and exterior angle add up to 180 degrees because angles on a straight line add up to 180 degrees.
The 3 interior angles of any triangle add up to 180 degrees and their 3 exterior angles add up to 360 degrees.
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They are all 60 degrees.
Use a protractor and you'll find that the 3 interior angles add up to 180 degrees and that the 3 exterior angles add up to 360 degrees
Theorem: An measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles.An exterior angle is formed by one side of a triangle and the extension of an adjacent side of the triangle.In the triangle at the right,
No, you cannot find the exterior angle before the interior because the interior angles can vary in many ways.
Measure them with a protractor