A side on any square or rectangle
-- improvement --
Not quite.
90 degrees looks like the junction of two sides of a square or rectangle.
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If it weren't 90 degrees it wouldn't be a rectangle. Are you sure you worded this the way you meant?
It looks like (and is) a rectangle. All angles will be 90 degrees.
it would look like a square with 90 degrees on every side!
a 90 degree angle is a perfect angle of a square so 80 degrees will be 10 degrees less.