<P> A kite, as defined above, may be either convex or concave, but the word "kite" is often restricted to the convex variety . A concave kite is sometimes called a "dart" or "arrowhead", and is a type of pseudotriangle . </P> <P> If all four sides of a kite have the same length (that is, if the kite is equilateral), it must be a rhombus . </P> <P> If a kite is equiangular, meaning that all four of its angles are equal, then it must also be equilateral and thus a square . A kite with three equal 108 ° angles and one 36 ° angle forms the convex hull of the lute of Pythagoras . </P> <P> The kites that are also cyclic quadrilaterals (i.e. the kites that can be inscribed in a circle) are exactly the ones formed from two congruent right triangles . That is, for these kites the two equal angles on opposite sides of the symmetry axis are each 90 degrees . These shapes are called right kites and they are in fact bicentric quadrilaterals (below to the left). Among all the bicentric quadrilaterals with a given two circle radii, the one with maximum area is a right kite . </P>

When can a kite be called a square