The 3 exterior angles of any triangle add up to 360 degrees and the 3 interior angles add up to 180 degrees.
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It is: 180-interior angle = exterior angle
because INTERIOR ANGLE 180 AND the exterior angle 180 so 180+180=360
Interior angle+exterior angle = 180 degrees
That depends on what type of triangle it is but in general:- 180-interior angle = exterior angle
The triangle has three exterior angles. Added together, their total is 180 degrees.(Same as the total of the three interior angles when they're added together.)