If it weren't 90 degrees it wouldn't be a rectangle. Are you sure you worded this the way you meant?
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A side on any square or rectangle -- improvement -- Not quite. 90 degrees looks like the junction of two sides of a square or rectangle.
It looks like (and is) a rectangle. All angles will be 90 degrees.
It is exactly 90 degrees in angle measure. Take the angles on a rectangle or square for example.
Both a square and a rectangle have 4 angles of 90 degrees.
All angles of a rectangle are 90 degrees.