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.)
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Interior angle+exterior angle = 180 degrees
The 3 exterior angles of any triangle add up to 360 degrees and the 3 interior angles add up to 180 degrees.
-- A scalene triangle has three interior angles and three exterior angles. -- The sum of the interior angles is 180 degrees, and no two of them are equal. -- The sum of the exterior angles is also 180 degrees, and no two of them are equal. -- The sum of each interior angle and its adjacent exterior angle is 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.
It is: 180-interior angle = exterior angle