Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 339
edral Z Q-CD-M is a rt. dihedralZ, and plane PQl. plane MN. q.e.d. Keasons 1. §619. 2. §63. 3. §670. 4. §619. 5. §677. Ex. 1211. If from the foot of a per-pendicular to a plane a line is drawn atright angles to any line in the plane, theline drawn from the point of intersec-tion so formed to any… … BOOK VI 329 Proposition XXIII. Theorem 679. If two planes are perpendieular to each other,any line in one of them, perpendicular to their intersec-tion, is perpendicular to the other.
Geometry, Plane · Geometry, Solid
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