# What is a regular quadrilateral called?

A regular quadrilateral is a square.

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A regular quadrilateral is called a square.

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- Why is every rectangle a quadrilateral?
- If all four sides of a quadrilateral are congruent will the angles be congruent too?
- A parallelogram has sides with lengths of #15 # and #12 #. If the parallelogram's area is #45 #, what is the length of its longest diagonal?
- Two opposite sides of a parallelogram each have a length of #3 #. If one corner of the parallelogram has an angle of #(2 pi)/3 # and the parallelogram's area is #18 #, how long are the other two sides?
- How many lines of symmetry does a parallelogram have?

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