-- one of them is 90 degrees
-- the other two add up to 90 degrees
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The sum of the interior angles of any triangle is 180 degrees. Whether or not it is right angled is irrelevant.
All three interior angles of a spherical triangle may be right angles.
The interior angles of a triangle add to 180 degrees. This is true for any triangle, whether it is obtuse angled, right angles or acute.
A scalene triangle has no right angles but it has 3 interior acute angles that add up to 180 degrees
It can be if the interior angles are 45, 45 and 90 degrees