Ha solo una coppia di lati paralleli, , , , TRAPEZIO, Ha i lati opposti paralleli e congruenti, gli angoli opposti congruenti, , , , PARALLELOGRAMMA, Ha gli angoli opposti congruenti, i lati opposti paralleli e tutti congruenti, , , , ROMBO, Ha gli angoli congruenti e retti, i lati opposti paralleli e congruenti a coppie, , , , RETTANGOLO, Ha gli angoli congruenti e retti, i lati opposti paralleli e tutti congruenti, , , , QUADRATO.

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