In a triangle, each exterior angle is equal to the sum of the two opposite interior angles.
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The exterior angle of a triangle is equal to the sum of the two opposite interior angles. So if a triangle had points A, B and C: The exterior angle at B would equal the sum of interior angles at A and C. Similarly, the exterior angle at C would equal the sum of interior angles at A and B And the the exterior angle at A would equal the sum of interior angles at C and B.
They both add up to 180 degrees when on a staight line.
ones inside ones outside
The exterior angles always, in any shape, add up to 360. The interior angles sum depends on the number of sides.
Providing that it is a regular hexagon then the each interior angle measures 120 degrees and each exterior angle measures 60 degrees