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What is the sum of the interior angles of a right triangle?

  1. 120 degrees

  2. 180 degrees

  3. 360 degrees

  4. 90 degrees

The correct answer is: 180 degrees

The sum of the interior angles of any triangle, including a right triangle, is always 180 degrees. This principle is grounded in the fundamental properties of triangles in Euclidean geometry. A right triangle specifically contains one angle that measures 90 degrees, but the sum of all three angles must still add up to 180 degrees. Therefore, regardless of the specific measures of the other two angles, which in a right triangle must complement the 90 degrees to total 180 degrees, the correct answer is indeed 180 degrees. Other options, such as 120 degrees, 360 degrees, and 90 degrees, do not correctly represent the sum of angles in a triangle.