# Are All Parallelograms Rectangles?

All parallelograms are not considered rectangles. A rectangle has four corners that represent ninety degree angles. A parallelogram has four corners, but the angles can be any measurement.
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Q&A Related to "Are All Parallelograms Rectangles?"
 because that is how rectangles are defined. that's like asking why are all circles round. http://wiki.answers.com/Q/Why_are_all_rectangles_p...
 A rectangle is a four-sided http://www.chacha.com/question/why-are-all-rectang...
 All rectangles are, but a trapezoid is not a parallelogram because only one pair of sides is parallel. http://www.kgbanswers.com/why-arent-all-rectangles...
 http://www.math.com/school/subject3/less…. Move the cursor and it will give you the special characteristics. isosceles is only a triangle. http://www.mathsteacher.com.au/year7 http://answers.yahoo.com/question/index?qid=201203...
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A parallelogram is a four sided shape like a square, diamond, and a rectangle. A rectangle is always a parallelogram. ...
The other parallelograms that are not rectangles are the square and the rhombus. The rhombus has four sides of equal length, equal opposite angles and diagonals, ...
Yes, a trapezoid is a parallelogram. It has four sides and the opposite sides are of equal length. A square is also a parallelogram, as is a rectangle. ...