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" The projection of a point on a plane is the foot of the perpendicular drawn from the point to the plane. "
The elements of geometry, in eight books; or, First step in applied logic - Pagina 43
door L J V. Gerard - 1874
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Mathematical Dictionary and Cyclopedia of Mathematical Science: Comprising ...

Charles Davies, William Guy Peck - 1855 - 592 pagina’s
...sufficient to fix the position of these elements in space. The projection of a point upon a plane, is the foot of the perpendicular drawn from the point to the plane ; the perpendicular is called the projecting line of the point. If the projection is made upon...
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Elementary geometrical drawing

Samuel H. Winter - 1861
...Def. — The given planes are called the PLANES OF PROJECTION. 3. Def. — The PROJECTION OF A POINT is the foot of the perpendicular, drawn from the point to the plane of projection. 4. Def. — This perpendicular is called the PROJECTOR of the point. If A (Fig....
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Geometrical Conic Sections: An Elementary Treatise in which the Conic ...

John Stuart Jackson - 1872 - 108 pagina’s
...CHAPTER I. On the Method of Projections. 1. DEFINITIONS. The Orthogonal projection of a point on a plane is the foot of the perpendicular drawn from the point to the plane. The plane on which the projection is made is called the plane of projection. The orthogonal...
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Elements of Geometry with Exercises for Students: An an Introduction to ...

Aaron Schuyler - 1876 - 364 pagina’s
...(14-4, 8). 3. Equivalent surfaces are those whose areas are equal. 4. The projection of a point upon a line is the foot of the perpendicular drawn from the point to the line. If the point is on the line, it is its own projection. 5. The projection of a finite straight line...
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The Elements of Plane and Solid Geometry: With Chapters on Mensuration and ...

Isaac Sharpless - 1879 - 266 pagina’s
...plane when, being produced ever so far, it does not meet it. 4. The projection of a point on a plane is the foot of the perpendicular drawn from the point to the plane. 5. The projection of a line on a plane is the line formed by the projection of all its points....
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Elements of Plane Geometry

Franklin Ibach - 1882 - 196 pagina’s
...ELEMENTS OF PLANE GEOMETRY. PROJECTION. DEFINITIONS. 258. The Projection of a Point upon an indefinite straight line is the foot of the perpendicular drawn from the point to the line. Thus, the projection of the point C upon the line AB is the point E. C E The Protection of n Finite...
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The Elements of Euclid, books i. to vi., with deductions, appendices and ...

Euclides - 1884
.... BH' = AH'2, AB in this case also may be said to be divided in medial section. 7. The projection t of a point on a straight line is the foot of the perpendicular drawn from the point to the straight line. , B. _0 D Thus D is the projection of A on the straight line BC. 8. The projection of...
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THE ELEMENTS OF GEOMETRY.

GEORGE BRUCE HALSTED - 1885
...is perpendicular to a given plane, the other is also.) 579. The projection of a point upon a plane is the foot of the perpendicular drawn from the point to the plane. 225 These perpendiculars are all in the same plane, since any two are parallel, and any third...
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The Elements of Geometry

George Bruce Halsted - 1886 - 366 pagina’s
...is perpendicular to a given plane, the other is also.) 579. The projection of a point upon a plane is the foot of the perpendicular drawn from the point to the plane. These perpendiculars are all in the same plane, since any two are parallel, and any third is...
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A Text-book of Geometrical Deductions: Book I [-II] Corresponding to ..., Boek 2

James Andrew Blaikie, William Thomson - 1892
...P, Q are their projections on OX ; and R, S are their projections on OY ; show that PR a QS. TE' — The projection of a point on a straight line is the...the perpendicular drawn from the point to the line. CHAPTER II. PROBLEMS. 39. Problems which follow directly from known propositions. 1. Divide a given...
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