Some missions were built as four sided enclosures. The inside would then be a four-sided open space which is called a quadrangle.
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An invisible quadrangle!
No, but a quadrangle is the same as a quadrilateral.
A square is both a quadrangle and a parallelogram.
In New York there is a quadrangle which is surrounded by sky scrapers
No, a quadrangle has four angles and four sides.