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In plane geometry, a square is a polygon with four equal sides and equal angles. Those angles are then necessarily right angles. Squares are regular quadrilaterals, rectangles, rhombi, kites, parallelograms, and isosceles
trapezoids/isosceles trapezia.
The diagonals of a square are equal and conversely, if the diagonals of a rhombus are proven to be equal,
then that rhombus must be a square.
The coordinates for the vertices of a square centered at the origin and with side length 2 are (±1, ±1),
while the interior of the same consists of all points (x0, x1) with
-1 < xi < 1.
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