In Euclidean plane geometry, a rectangle is any quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°).
It can also be defined as a parallelogram containing a right angle.
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something that is owned like a rectangle owns four cortices and two parallel lines.
A rectangle is classed as a 4 sided quadrilateral in math.
A rectangle, by definition, has 4 right angles.
Yes. That is part of the definition of a rectangle.
Yes, if it has right angles, it is by definition a square, and therefore also a rectangle.