Pre-AlgebraQuadrilaterals
Quadrilaterals
Learn about the properties and characteristics of different types of quadrilaterals, including squares, rectangles, parallelograms, rhombuses, and trapezoids.
Types of Quadrilaterals
Parallelogram
A quadrilateral with opposite sides parallel and equal.
- Opposite sides are parallel and equal
- Opposite angles are equal
- Consecutive angles are supplementary
- Diagonals bisect each other
Rectangle
A parallelogram with four right angles.
- All angles are 90 degrees
- Opposite sides are parallel and equal
- Diagonals are equal and bisect each other
Square
A rectangle with four equal sides.
- All sides are equal
- All angles are 90 degrees
- Diagonals are equal and perpendicular
Rhombus
A parallelogram with four equal sides.
- All sides are equal
- Opposite angles are equal
- Diagonals are perpendicular
Trapezoid
A quadrilateral with exactly one pair of parallel sides.
- One pair of parallel sides (bases)
- Non-parallel sides are called legs
- If legs are equal, it's an isosceles trapezoid
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Quick Tips
- Remember that all squares are rectangles, but not all rectangles are squares.
- The sum of interior angles of any quadrilateral is 360 degrees.
- In a parallelogram, opposite sides are parallel and equal.