Depends on the shape. A right triangle has one right angle, a rectangle has 4, an equilateral triangle has none, a circle has no angles. There are polygons with more than 4 right angles, and there is no limit on how many, but those with more than 4 are not convex.
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A right angle is 90 degrees and the 4 interior angles of a square and a rectangle are all right angles.
Depends on a concave what. There can be infinitely many right angles in concave shape that keeps going in and out before returning to its starting point.
A shape with five sides would be a pentagon, but a shape can not have 5 right angles. Squares and Rectangles are both shapes with 4 sides and 4 right angles. They are the only shape with the same amount of right angles as there is sides.
It can take the shape of 2 right angles, 1 acute angle and 1 obtuse angle that all add up to 360 degrees
A regular 5 sided pentagon is one such example of a shape having no right angles