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A square. All sides are equal, all angles are 90 degrees.
"Types of parallelograms
Rhomboid - A quadrilateral whose opposite sides are parallel and adjacent sides are unequal, and whose angles are not right angles
Rectangle - A parallelogram with four angles of equal size (right angles).
Rhombus - A parallelogram with four sides of equal length.
Square - A parallelogram with four sides of equal length and four angles of equal size (right angles)."
Source and further information:
http://en.wikipedia.org/wiki/Parallelogram
a square
A rectangle is a parallelogram with all the same angles.
A rhombus is a parallelogram with all the sides being the same length.
I don't think there is such a thing as a parallelogram with both properties?
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You're reading What is a paralellogram in which all sides have the same length and all angles have the same meaure?
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Comments
Well, it goes to show you Wikipedia can't be trusted. They explicitly claim a square is not a parallelogram, yet the site below confirms what you said. Thanks a lot Suckipedia. Like+.
http://www.mathsisfun.com/quadrilaterals.html
by srosa on February 8th, 2010