Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 330
given plane. 654. Cor. II. If two planes are each parallel to a thirdplane, they are parallel to each other. (Hint. See § 180.) 655. Def. The projection of a point upon a plane is the footof the perpendicular from the point to the plane. 656. Def. The projection of a line upon a plane is the… … Given str. line AB not J_ plane MN. To prove the projection of AB upon MN a str. line. Argument 1. Through (7, any point in AB^ draw CD JL plane MN. 2. Let the plane determined by AB and CD intersect plane MN in the str. line EF, 3. From H, any point in AB^ draw HK^ in plane AF, II CD. 4. Then HK…
Geometry, Plane · Geometry, Solid
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