either a square or a rectangle
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rectangle
No.Examples:The right angled triangles {3, 4, 5} & {6, 8, 10} are similar;The right angled triangles {3, 4, 5} & {5, 12, 13} are just two right angled triangles.
A square is a right angled parallelogram with 4 right angles and all opposite sides parallel.
square
A square or quadrilateral.