1&6+Quadrilaterals


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

 

The Rectangle
A **rectangle** is a four-sided shape where every angle is a [|right angle] (90°). Also **opposite sides** are [|parallel] and of equal length.
 * [[image:http://www.mathsisfun.com/images/quadrilateral-rectangle.gif width="193" height="132" caption="Rectangle"]] || ||  ||
 * ^  || [[image:http://www.mathsisfun.com/images/quadrilateral-right-key.gif width="19" height="22"]] || //means "right angle"// ||
 * ^  || [[image:http://www.mathsisfun.com/images/quadrilateral-equal-key.gif width="11" height="19"]]and[[image:http://www.mathsisfun.com/images/quadrilateral-equal-key2.gif width="19" height="19"]] || //show equal sides// ||

The 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: They still have 4 sides, but two sides cross over.  Quiz on Quadrilaterals

media type="custom" key="4921009" [|Matching Game on Quadrilaterals]

game number two : http://teams.lacoe.edu/documentation/classrooms/amy/geometry/6-8/activities/quad_quest/quad_quest.html media type="youtube" key="v7LZQNvZWFs" width="429" height="359"