Nelinurk
Nelinurk ehk tetragoon on hulknurk, millel on neli tippu (ja neli külge).
Korrapärast nelinurka nimetatakse ruuduks.
Kindlate omadustega nelinurkasid nimetatakse: ristkülik, romb, romboid, rööpkülik, trapets, trapetsoid.
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