Properties of Quadrilaterals

PARALLELOGRAM:

• Opposite sides: parallel & equal

• Opposite angles: equal

• Diagonals: bisect each other (NOT perpendicular)

• Rotational symmetry: Order 2 (180°)

• Line symmetry: 0

RECTANGLE:

• Opposite sides: parallel & equal

• All angles: 90°

• Diagonals: equal, bisect each other (NOT perpendicular)

• Rotational symmetry: Order 2 (180°)

• Line symmetry: 2

SQUARE:

• All sides equal with 2 pairs of parallel sides

• All angles: 90°

• Diagonals: equal, bisect each other, ARE perpendicular

• Rotational symmetry: Order 4

• Line symmetry: 4 )

RHOMBUS:

• All sides equal with 2 pairs of parallel sides

• Opposite angles equal

• Diagonals: bisect each other, ARE perpendicular

• Rotational symmetry: Order 2

• Line symmetry: 2

KITE

• Two pairs of adjacent sides equal with 0 parallel sides

• One pair of opposite angles equal

• Diagonals: intersect at 90° (perpendicular) (one bisects the other)

• Rotational symmetry: Order 1

• Line symmetry: 1

TRAPEZIUM

• Angles beside each other = 180°

• One pair of opposite sides parallel

• Diagonals: NOT perpendicular

• Rotational symmetry: Order 1

• Line symmetry: 0

ISOSCELES TRIANGLE:

• One pair of opposite sides parallel

• Legs equal, base angles equal

• Diagonals equal (NOT perpendicular)

• Rotational symmetry: Order 1

• Line symmetry: 1