A cuboid.
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octagon
6 faces with 4 right angles on each face, so 6 x 4 = 24 right angles
A rectangular prism has six faces; each face has four right angles. There are 24 right angles in all.
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.
A regular 5 sided pentagon is one such example of a shape having no right angles