Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 320
630. Def. A straight line is oblique to a plane if it is neitherperpendicular nor parallel to the plane. 631. E>ef. Two planes are parallel if they cannot meet BOOK VI 309 Proposition VII. Theorem 632. Two planes perpendicular to the same straightline are parallel. X MR 7 7 N S Given planes MN…
Geometry, Plane · Geometry, Solid
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