Geometry / Mr. Hansen 11/18/2004 [rev. 1/15/2005]

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Quadrilateral Properties

	Definition	Properties (sides)	Properties (Ðs)	Properties (Other)
1. Quadrilateral	4 straight sides
2. Kite	convex + sides a, a, b, b	see def.	x, y, z, y	one diag. ^ bis. the other; one diag. bis. its Ðs
3. Rhombus	sides a, a, a, a	see def.	x, y, x, y (x + y = 180°)	both diags. ^ bis. each other; both diags. bis. their Ðs; 4 @ rt. Ds formed
4. Parallelogram (abbreviated )		a, b, a, b	x, y, x, y (x + y = 180°)	diags. bis. each other
5. Trapezoid
6. Isosceles Trapezoid		a, c, a, b (where b ¹ c)	x, y, y, x (x + y = 180°)	diags. @
7. Rectangle	+ rt. Ð	see	all 90°!	diags. @; also all properties of
8. Square	rectangle + rhombus	a, a, a, a	all 90°!	all properties of kite, rhombus, , and rectangle; 4 @ isosceles rt. Ds formed by diags.