The sum of all the angles of a quadrialateral, whether its regualr or irregular is 360 degrees.
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It's impossible for a quadrilateral to have no equal sides and have right angles.
A square or a rectangle... though technically they have four equal angles...
No. A square fits the classification of a quadrilateral and a parallelogram, but that isn't necessarily the definition. A rhombus is a quadrilateral and a parallelogram, and so are other irregular quadrilaterals. The correct definition would be a parallelogram and a quadrilateral with four right angles and all equal sides.
A rhombus is a quadrilateral with 4 equal sides and if the angles are also all equal that that rhombus is a square.
rhombus