Quadrilaterals have 4 sides, 4 angles, and 4 vertices.
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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
ALL quadrilaterals have 4 angles
A mathematical diamond is a quadrilateral with four sides and four angles.
All quadrilateral have four angles. It is possible that all four angles are right angles, even if the quadrilateral is not a square (this would be a rectangle).