Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 339
Given str. line AB1^ plane Ml!^ and plane FQ containing lineAB and intersecting plane MN in CD,To prove plane PQ 1. plane UN, Argument 1. AB L CD, 2. Through B, in plane MN, draw BE ± CD. 3. Then Z ABE is the plane Z of dihedral Z Q-CD-M, 4. But Z ^i?^ is a rt. Z. 6. .*. dihedral Z Q-CD-M is a rt.…
Geometry, Plane · Geometry, Solid
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