Adjacent
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A kites opposite sides are always congruent
When a figures opposite sides are not the same.
A 3D object that has all of it's sides slanted inwards; opposite of convex.
It is not possible for a quadrilateral in Euclidean plane geometry to have no equal angles and still have its opposite sides parallel.It's possible for a quadrilateral to have no equal angles and two of its sides parallel (opposite ones, obviously; adjacent sides can't possibly be parallel). That would be a trapezoid.
They are angles formed when two straight lines intersect: they are on opposite sides of the point of intersection.