Wednesday, December 30, 2009

Which would not guarantee the the figure is a rectangle?

I just hate these types of problems and all of them seem right to me. I dont know how to tell what one is different. Can you please explain how you found the answer to this:





Which of these descriptions would not guarantee that the figure was a rectangle?


[A] a quadrilateral with all four angles right [B] a quadrilateral with all congruent angles


[C] a parallelogram with perpendicular diagonals [D] a parallelogram with a right angleWhich would not guarantee the the figure is a rectangle?
c








A must be a rectangle because it has 4 right angles


B must also be a rectangle be cause all 4 angles are congruent


D is a four sided figure with a right angle (a perpendicular side) and also has a parallel sides. Meaning the angle there must also be 90degrees

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