Quadrilateral properties: summary
Compare the side, angle and diagonal properties of six common quadrilaterals.
Square
- Four equal sides.
- Four right angles.
- Opposite sides are parallel.
- Diagonals are equal and bisect each other at right angles.
Rectangle
- Opposite sides are equal and parallel.
- Four right angles.
- Diagonals are equal and bisect each other.
Parallelogram
- Opposite sides are equal and parallel.
- Opposite angles are equal.
- Adjacent angles add to
. - Diagonals bisect each other.
Rhombus
- Four equal sides.
- Opposite sides are parallel.
- Opposite angles are equal.
- Diagonals bisect each other at right angles.
Trapezium
- One pair of opposite sides is parallel.
- Angles along either non-parallel side add to
. - In an isosceles trapezium, the non-parallel sides and each pair of base angles are equal.
Kite
- Two pairs of equal adjacent sides.
- The opposite angles between the unequal sides are equal.
- The diagonals meet at right angles.
- One diagonal bisects the other.