Formula for finding the total sum of interior angles of any polygon is:
(number of sides-2)*180
A triangle has 3 sides.
(3-2)*180 = 180 degrees
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The 3 interior angles of any triangle add up to 180 degrees
Sum of interior angles - 180 degree (each side 60 degree) Sum of exterior angles of a polygon - 360 degree
The interior angles of a triangle sum to 180 degrees. Whether it is a right triangle or not is totally irrelevant.
Sum of interior angles of a triangle total 180 degrees
The sum of the angles in any triangle is 180 degrees.