270. A right angle is ninety degrees.
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3 because 3*90 = 270 degrees
The 3 interior angles of a right angle triangle add up to 180 degrees
Since a triangle has 3 angles that total 180 degrees, it can have only 1 right angle. Since a triangle has 180 degrees and 3 angles, it can only have 1 right angle.
A right angle triangle has 3 sides and 3 inside angles of 90 degrees and two acute angles that add up to 90 degrees and all 3 angles add up to 180 degrees.
The 3 interior angles of any triangle add up to 180 degrees