At each vertex of a triangle, an exterior angle of the triangle may be formed by extending ONE SIDE of the triangle.
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They are all 60 degrees.
Subtract the two known angles from 180 degrees will give you the missing angle
take away the interior angle adjacent to it from 360
If you are trying to find the missing angle of a triangle you do 180 degrees minus your two other angles. However if you are trying to find the missing angle of a quadrilaterals you do the same thing but with 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,