Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 325
fN Given str. lines AB and CD J_ plane MN.To prove AB II CD. The proof is left as an exercise for the student. Hint. Suppose that AB is not |I CD, but that some other line throughB, as BE, is II CD. Use § 638. Proposition XIV. Theorem 641. If a straight line is parallel to a plane, the… … Given line AB II plane MN, and plane AD, through AB, inter-secting plane MN in line CD,To prove AB II CD, The proof is left as an exercise for the student. Hint. Suppose that AB is not II CD. Show that AB will then meetplane MN. BOOK VI 315 642. Cor. I. If a -plane intersects one of two…
Geometry, Plane · Geometry, Solid
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