A quadrilateral is a four-sided figure that has straight sides and no curves. It can be a square and any shape that has four sides that connect, hence four angles and four vertices. Examples of quadrilaterals are a square, rectangle, parallelogram, rhombus.
A quadrilateral is a 4 sided shape such as a square, rectangle, rhombus, parallelogram ... etc
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It is an inscribed quadrilateral or cyclic quadrilateral.
It is simply a quadrilateral - there is no special name for such a quadrilateral.
It is an arrowhead quadrilateral
There is no specific name for such a quadrilateral.
No, a square is an equilateral quadrilateral. http://en.wikipedia.org/wiki/Quadrilateral