Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 322
mpanying diagram AB and CD lie in the sameplane. Angle CBA^So^, angle BCD = S6°,angle ABE = 90°, ^£ lying in plane MN. IsCD necessarily perpendicular to plane MN?Prove your answer. Ex. 1169. Can a line be perpendicular toeach of two intersecting planes ? Prove. Ex. 1170. If one of two planes is… … 312 SOLID GEOMETRY Proposition XL Problem 637, Through a given point to construct a line per-pendicular to a given plane*
Geometry, Plane · Geometry, Solid
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