Yes. It always does, in every triangle.
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The interior angles of a triangle must lie within the range (0, 180) degrees. For all other polygons, the interior angles must be in the range (0, 360) excluding 180 degrees.
The sum of all inner angles within a triangle is 180 degrees.
Because the 3 angles within a triangle add must up to 180 degrees and 2 right angles add up to 180 degrees
The 4 interior angles of a quadrilateral add up to 360 degrees
No. Within a triangle, the sum of all of the angles must equal 180 degrees. All three angles are acute (60 degrees) in an equilateral triangle, while only two are in a right triangle, the other being a right angle (90 degrees). There obviously could not be three right angles (270 degrees).