What Are The Special Parallelograms?
Rhombus
A parallelogram with four congruent sides.
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| http://math.tutorvista.com/geometry/quadrilaterals.html
In the example above, the diagonals bisect the angles and they also bisect each other.
Rectangle
Parallelogram with four congruent angles or an "equiangular parallelogram."
http://www.geom.uiuc.edu/~dwiggins/conj28.html
The diagonals of a rectangle are congruent and they bisect each other.
Equilateral Rectangle
Equiangular rhombus
http://quizlet.com/6547298/geometry-terms-cfh-flash-cards/
Diagonals are congruent, perpendicular and they bisect each other.
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