 | Gaspard Monge (comte de Péluse.), John Fry Heather - 1851 - 152 pages
...comparison, planes whose positions are easily imagined. 3. DEFINITION. — The projection of a point upon a plane is the foot of the perpendicular let fall from the point upon the plane. If then we have two planes whose positions in space are known, and on each of these... | |
 | John Fry Heather - Geometry, Descriptive - 1851 - 156 pages
...comparison, planes whose positions are easily imagined. 3. DEFINITION. — The projection of a point upon a plane is the foot of the perpendicular let fall from the point upon the plane. If then we have two planes whose positions in space are known, and on each of these... | |
 | W.E. WORTHEN - 1857 - 600 pages
...space of a point, by referring it planes whose position is established. The projection of a point upon a plane is the foot of the perpendicular let fall from the point on the plane. If, therefore, on two planes not parallel to each other, whose positions are known, we... | |
 | William Ezra Worthen - Architectural drawing - 1857 - 632 pages
...space of a point, by referring it planes whose position is established. The projection of a point upon a plane is the foot of the perpendicular let fall from the point on the plane. If, therefore, on two planes not parallel to each other, whose positions are known, we... | |
 | Auguste Frédéric Lendy - Technology & Engineering - 1862 - 562 pages
...step that must be taken is the representation of points. This is done by projections on planes. (66). The projection of a point on a plane is the foot of the perpendicular drawn from that point to the plane. Thus, if A be a given point in the space, and Fio. 94. 1*. MN any... | |
 | Francis Henney Smith - Geometry, Descriptive - 1868 - 86 pages
...method of projections. Descriptive Geometry is, therefore, based upon the method of projections. 3. The projection of a point on a plane is the foot of the perpendicular let fall from this point on the plane. The plane on which the projection is made is called the plane of projection;... | |
 | William Henry Besant - Conic sections - 1869 - 304 pages
...than that of the hyperbola, and less than that of the ellipse. CHAPTER VIII. PROJECTIONS. 164. DBF. The projection of a point on a plane is the foot of the perpendicular let fall from the point on the plane. If from all points of a given curve perpendiculars be let fall on a plane, the curve... | |
 | John Reynell Morell - Geometry - 1871 - 156 pages
...parallel to this plane : accordingly all these straight lines will be in one and the same plane. 126. The projection of a point on a plane, is the foot of the perpendicular drawn from the same point on to the plane'. (t ig. 1(W, b-) 1 Fig. 103 (a). Fig. 103 (b). § XXX. Dihedral... | |
 | John Stuart Jackson - 1872 - 208 pages
...Aa from some CONIC SECTIONS. 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... | |
 | William Guy Peck - Geometry, Analytic - 1875 - 226 pages
...the line. Thus, B, C, and D (Fig. 52), are the projections of the point P on the co-ordinate axes. The projection of a point on a plane, is the foot of a perpendicular from the point to the plane. Thus, Q, K, and S are the projections of the point P on... | |
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The projection of a point on a plane is the foot of the perpendicular let fall from the point to the plane. 
