a quadrilateral
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a crescent has 19 sides
A shape that has four straight sides and four angles is defined as a quadrilateral. If all four angles are right angles, it is a rectangle, and if all four sides are congruent, it is a square.
It has four sides. ;-)))))))))))))))
No. A quadrilateral has FOUR sides ('quad' is latin for 4), and so it can only have four sides. A polygon can have as many sides as you want, be that number odd or even, but a quadrilateral can only have four.
A quadrilateral - if the sides are straight lines.