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" The projection of a line upon a plane is the locus of the projections of all points of the line upou the plane. "
A course of geometrical drawing - Page 40
by William Schofield Binns - 1861
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Plane and Solid Geometry

Isaac Newton Failor - Geometry - 1906 - 440 pages
...to the hypothesis. § 567 .-. through AB only one plane can be passed -L to MN. QED 572 DEFINITION. The projection of a point upon a plane is the foot of the perpendicular drawn from the point to the plane. 573 DEFINITION. The projection of a line upon...
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Plane and Solid Geometry

Edward Rutledge Robbins - Geometry - 1907 - 428 pages
...perpendicular nor parallel to the plane. Two planes are parallel if they never meet when indefinitely extended. The projection of a point upon a plane is the foot of the perpendicular from the point to the plane. The projection of ;i line upon a plane is the line formed...
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Plane Geometry Developed by the Syllabus Method

Eugene Randolph Smith - Geometry, Plane - 1909 - 424 pages
...plane, then show that a perpendicular plane must contain these determining lines. 77. Projections. The projection of a point upon a plane is the foot of the perpendicular from that point to the plane. The projection of a line upon a plane is the locus...
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Plane and Solid Geometry

Clara Avis Hart, Daniel D. Feldman - Geometry - 1912 - 504 pages
...are each parallel to a third plane, they are parallel to each other. (HINT. See § 180.) 655. Def. The projection of a point upon a plane is the foot of the perpendicular from the point to the plane. 656. Def. The projection of a line upon a plane is the...
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Solid Geometry

Clara Avis Hart, Daniel D. Feldman - Geometry, Solid - 1912 - 220 pages
...are each parallel to a third plane, they are parallel to each other. (HINT. See § 180.) 655. Def. The projection of a point upon a plane is the foot of the perpendicular from the point to the plane. J d BOOK VI PROPOSITION XVIII. THEOREM 657. The projection...
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Practical Geometry and Graphics

David Allan Low - Geometrical drawing - 1912 - 468 pages
...orthographic projection is generally understood. In what follows projection will mean orthographic projection. The projection of a point upon a plane is the foot of the perpendicular let fall from the point on to the plane. The projection of a line upon a plane is...
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Solid Geometry

John Charles Stone, James Franklin Millis - Geometry, Solid - 1916 - 196 pages
...the planes which bisect these adjacent angles are perpendicular to each other. 338. Projections. — The projection of a point upon a plane is the foot of the perpendicular from the point to the plane. 339. Theorem. — The projection of a straight line...
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Solid Geometry

Claude Irwin Palmer - Geometry, Solid - 1918 - 192 pages
...apply § 191. EXERCISES 1. Prove the theorem of § 553 by § 580. 293 PROJECTIONS 582. Definitions. The projection of a point upon a plane is the foot of the perpendicular from the point to the plane. The projection of a line upon a plane is the locus of...
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Solid Geometry Developed by the Syllabus Method

Eugene Randolph Smith, William Henry Metzler - Geometry, Solid - 1918 - 232 pages
...plane, then show that a perpendicular plane must contain these determining lines. 77. Projections. The projection of a point upon a plane is the foot of the perpendicular from that point to the plane. The projection of a line upon a plane is the locus...
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Plane and Solid Geometry

Claude Irwin Palmer, Daniel Pomeroy Taylor - Geometry - 1918 - 460 pages
...2. A line cannot be perpendicular to each of two intersecting pianos. PROJECTIONS 582. Definitions. The projection of a point upon a plane is the foot of the perpendicular fiom the point to the plane. The projection of a line upon a plane is the locus of...
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