Quadrilaterals
A quadrilateral is a four-sided shape, and understanding types like squares, rectangles, and parallelograms helps identify their properties.
Core concept
A quadrilateral has four sides, four angles, and the sum of its interior angles always equals 360°.
How it works
A square has four equal sides and four right angles, while a rectangle has opposite sides equal and four right angles.
Why it matters
A parallelogram has opposite sides equal and parallel, while a rhombus has all sides equal but angles that aren't necessarily 90°.
Key detail
A trapezium has only one pair of parallel sides, distinguishing it from other quadrilaterals with two pairs of parallel sides.
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Quick notes
• Quadrilateral: 4 sides, 4 angles.
• Sum of interior angles = 360°.
• Square: 4 equal sides, 4 right angles.
• Rectangle: opposite sides equal, 4 right angles.
• Parallelogram: opposite sides equal, parallel.
• Rhombus: all sides equal, angles vary.
• Trapezium: only one pair of parallel sides.
• Each shape has distinct properties.