brick, rectangle, square @ Pixabay

This rectangle has four right angles and two equal adjacent sides. It is a parallelogram! It is a rectangle. Rectangle: a parallelogram that has four right angles and two equal adjacent sides. It is not a quadrilateral, but it may be called an oblong or rhombus when the opposite sides are of unequal lengths. A rectangle’s diagonals bisect each other and form four 90° angles at their intersection points so they can also serve as square corners for constructing rectangles with perpendicular opposite sides. Rectangular shapes tiled on two-dimensional surfaces such as floors have to obey these principles in order to appear rectangular; if some of those tiles are turned through 45° degrees then the lines will no longer intersects perpendicularly, therefore creating what appears like triangles between them rather than the desired rectangles.

Rectangle: a parallelogram that has four right angles and two equal adjacent sides. It is not a quadrilateral, but it may be called an oblong or rhombus when the opposite sides are of unequal lengths. A rectangle’s diagonals bisect each other and form four 90° angles at their intersection points so they can also serve as square corners for constructing rectangles with perpendicular opposite sides. Rectangular shapes tiled on two-dimensional surfaces such as floors have to obey these principles in order to appear rectangular; if some of those tiles are turned through 45° degrees then the lines will no longer intersects perpendicularly, therefore creating what appears like triangles between them rather than the desired rect

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