Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 324
§§ 148, 149. 6. Pi? is the perpendicular required. II. Proof Argument 1. Through the foot of PR (P in Fig. 1, R in Fig. 2) in plane MNy drawEF II ^P. 2. ^P _L plane PQ. 3. r, EF A. plane PQ. 4. .-. EF A. PR\ Le, PR ± EF.6. But PP ± CD.6. .*. PP ± phuie MN. Q.E.D. III. The discussion will be given… … —-i--r--^ Given point P and line PJ, through P\ A. plane MK.To prove PA the only line through P X MN. Argument 1. Either PA is the only line through P J- MN or it is not. 2. Suppose there exists another line through P ± MNj as PB; then PA andPB determine a plane. 3. Let this plane intersect plane…
Geometry, Plane · Geometry, Solid
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