Quadrilateral-meaning: A plane having four sides and four angles.

quadrilaterals.gif

The Rectangle

Rectangle

means "right angle"

and

show equal sides

A rectangle is a four-sided shape where every angle is a right angle (90°).
Also opposite sides are parallel and of equal length.

The Rhombus

Rhombus

A rhombus is a four-sided shape where all sides have equal length.
Also opposite sides are parallel and opposite angles are equal.
Another interesting thing is that the diagonals (dashed lines in second figure) of a rhombus bisect each other at right angles.

Complex Quadrilaterals

Oh Yes! when two sides cross over, you call it a "Complex" or "Self-Intersecting" quadrilateral like these:

Complex Quadrilaterals

They still have 4 sides, but two sides cross over.

Quadrilateral-meaning: A plane having four sides and four angles.## The Rectangle

means "right angle"show equal sidesrectangleis a four-sided shape where every angle is a right angle (90°).Also

opposite sidesare parallel and of equal length.## The Rhombus

A

rhombusis a four-sided shape where all sides have equal length.Also opposite sides are parallel

andopposite angles are equal.Another interesting thing is that the diagonals (dashed lines in second figure) of a rhombus bisect each other at right angles.

## Complex Quadrilaterals

Oh Yes! when two sides cross over, you call it a "Complex" or "Self-Intersecting" quadrilateral like these:They still have 4 sides, but two sides cross over.

Quiz on Quadrilaterals

http://www.interactivestuff.org/match/maker.phtml?featured=1&id=24 Matching Game on Quadrilaterals

game number two : http://teams.lacoe.edu/documentation/classrooms/amy/geometry/6-8/activities/quad_quest/quad_quest.html