92°. The angles in a triangle always add up to 180°.
A helpful way to remember what the interior angles add up to in any polygon is with this formula:
180 (n - 2), where n is the number of sides.
For example, with a triangle: 180 (3 - 2) = 180 (1) = 180. The interior angles in a triangle all add up to 180.
With a rectangle/quadrilateral: 180 (4 - 2) = 180 (2) = 360.
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