Birectangular :: Birectangular (a.) Containing or having two right angles; as, a birectangular spherical triangle..
Rectangular :: Rectangular (a.) Right-angled; having one or more angles of ninety degrees.
Rectangularity :: Rectangularity (n.) The quality or condition of being rectangular, or right-angled..
Trirectangular :: Trirectangular (a.) Having three right angles. See Triquadrantal.
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