A kite is a planar convex quadrilateral consisting of two adjacent sides of length and the other two sides of length . The rhombus is a special case of the kite, and the lozenge is a special case of the rhombus.
The area of a kite is given by
(1)
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where
(2)
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(3)
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are the lengths of the polygon diagonals (which are perpendicular).
The 120-90-60-90 kite with edge ratios is the basis for the polyomino-like objects known as polykites.
"Kite" is also the name given to the Penrose tile illustrated above.