Quadrilateral Requirements...Experts help needed

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A. What is/are the requirement(s) for a quadrilateral to be a parallelogram?
B. What is/are the requirement(s) for a quadrilateral to be a rhombus?
C. If opposite sides of a quadrilateral are equal, does that make it a parallelogram?

Experts please advise. thanx
Rachvik

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by Night reader » Thu Feb 10, 2011 4:33 am
RACHVIK wrote:A. What is/are the requirement(s) for a quadrilateral to be a parallelogram?
B. What is/are the requirement(s) for a quadrilateral to be a rhombus?
C. If opposite sides of a quadrilateral are equal, does that make it a parallelogram?

Experts please advise. thanx
here's some elementary data https://www.mathsisfun.com/quadrilaterals.html before experts shed their light

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