Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 334
uadrilateral is a quadrilateral inspace, i.e. if the vertices of the quadrilateral are not all in the sameplane ? Prove. BOOK VI 323 … 671. Def. Two dihedral angles are adjacent if they havea common edge and a common face which lies betweenthem ; thus Z A-BC-D andZd-CB-E are adj. dihe- ^«dral A 672. Def. If one planemeets another so as tomake two adjacent dihe-dral angles equal, each ofthese angles is a rightdihedral angle, andthe…
Geometry, Plane · Geometry, Solid
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