Squares don't 'represent' angles.
A shape is a square only if it has four equal sides and four 90-degree angles.
If it doesn't have those, then it's not a square.
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Equiangular quadrilaterals are four-sided polygons that have equal angles. These include squares (90 degree angles) and rectangles (90 degree angles).
All have 90 degree angles.
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If there are two 90 degree angles on the shape (example: squares or rectangles' corners)
Rectangles and squares are the only parallelograms that contain 90 degree angles.