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quadrilateral
4 sides shape
trapezoid
has at least 1 pair of parallel sides
parallelogram
2 pairs of parallel sides
rectangles
4 right angles
square
4 congruent sides 4 right angles
rhombuses
4 congruent sides
circumcenter
perpendicular bisecors
incenter
angle bisector
orthocenter
altitude
centroid
median
Note 
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