Check to see that -- it has four sides -- its two diagonals are equal.
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A rectangle is a shape which has all inner angles equal to 90 degrees. A square is A RECTANGLE that has all sides of the same size. Therefore, using informatical slang, SQUARE INHERITS RECTANGLE.
rectangle
From Wikipedia: "...a rectangle is any quadrilateral with four right angles". So there isn't much to prove, that's how the rectangle is defined.
A train but with a big rectangle.
another rectangle.