The exterior angles of a triangle add up to 360 degrees.
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Interior angle+exterior angle = 180 degrees
Actually, no. The sum of the exterior angles of a triangle is 360 degrees. The sum of the interior angles of a triangle is 180 degrees.
Any exterior angle of a triangle always equals the sum of the two interior opposite angles.
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 are called supplementary angles.