ALL quadrilaterals have 4 angles
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A rhombus is an irregular 4 sided quadrilateral because although it has 4 equal sides it does not have 4 equal interior angles.
A trapezoid is a quadrilateral with a set of parallel lines. Because it is a quadrilateral, it has four angles.
A quadrilateral has 4 interior angles that add up to 360 degrees
It is referred to as an "irregular quadrilateral." It has 4 sides and the sum of its angles measures 360 degrees. However, it does not have any special properties.
ALL quadrilaterals have four sides and four angles. That's what 'quadrilateral' means. The quadrilaterals include the parallelogram, the trapezium, the kite, and the irregular quadrilateral. The parallelograms include the rhombus and the rectangle. The rhombus and the rectangle both include the square.