Every rectangle, including every square, has 4 right angles.
Any shape with more than 4 sides can have 4 right angles, but it doesn't have to.
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4 right angles
A RECTANGLE has 4 sides and 4 right angles.
A square has 4 right angles.
4 right angles, by definition, are four angles of the same measure, and therefore must be congruent angles.
There are 4 ninety degree right angles