quadrantal spherical triangle

quadrantal spherical triangle

[kwä¦drant·əl ¦sfir·ə·kəl ′trī‚aŋ·gəl]
(mathematics)
A spherical triangle that has one and only one right angle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.