The three angle sum of ANY triangle is 180 degrees.
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-- 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.
If it is a scalene triangle then: 180 - the sum of the 2 known angles = x angle
In a scalene triangle, the angle sum is still 180 degrees. What defines a scalene triangle is that it has three sides with different lengths, and therefore, also different angles. It can be a right triangle for example, with the angles 30, 90, and 60 degrees. It's angle sum always sums up to 180 as in all triangles. Note: It doesn't have to be a right triangle. It can be any kind of triangle as long as it has three different angles and sums up 180 degrees.
The angle of a scalene triangle can have any value between 0 and 180 degrees provided that:it is not equal to either of the other two angles, andthe sum of all three angles is 180 degrees.
If you have the other two angles, you can subract them from 180 degrees, which is the sum of the angles in any triangle.