 | John Fry Heather - Geometry, Descriptive - 1851 - 156 pages
...selecting for the objects of 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... | |
 | Gaspard Monge (comte de Péluse.), John Fry Heather - 1851 - 152 pages
...selecting for the objects of 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... | |
 | Charles Davies, William Guy Peck - Mathematics - 1855 - 628 pages
...projections, two of which are, in general, 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... | |
 | W.E. WORTHEN - 1857 - 600 pages
...Thus the point a in the fig. is used as a centre for three arcs, 5 Z, cm, d n. GEOMETEICAL PKOJECTIOK. ARCHITECTURAL and mechanical drawing is generally...perpendiculars from each plane at the projected points : their intersection will be the point. If from every point of an indefinite straight line'AB (fig.... | |
 | William Schofield Binns - 1861 - 238 pages
...horizontal plane. Let at be a point in space whose projections upon AB, B c are •a." required. 8. The projection of a point upon a plane is the foot of a perpendicular let fall from the point upon the given plane. From a, therefore, draw a a', a a', respectively... | |
 | William Henry Besant - Conic sections - 1869 - 304 pages
...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 formed by the feet... | |
 | The Journal of the Royal Agricultural Society of England - 1870 - 796 pages
...of a stream) and a line (on this side of the stream) marked out by two pickets ; how would you find the foot of the perpendicular let fall from the point on the line, if you had nothing but a measuring tape and pickets? 6. Plot the following notes, and determine... | |
 | Royal Agricultural Society of England - Agriculture - 1870 - 750 pages
...of a stream) and a line (on this side of the stream) marked out by two pickets ; how would you find the foot of the perpendicular let fall from the point on the line, if you had nothing but a measuring tape and pickets ? 6. Plot the following notes, and determine... | |
 | James Maurice Wilson - 1872 - 160 pages
...therefore AB : BC :: PQ : QR\ THE LINE INCLINED TO THE PLANE. Def. 6. The projection of a point on a plane is the foot of the perpendicular let fall from the point to the plane. Def. 7. The projection of a line on a plane is the locus of the feet of the perpendiculars... | |
 | James Martin (of the Wedgwood inst, Burslem.) - 1876 - 334 pages
...the perpendiculars meet the given planes, are the projections of the point A in space. NOTE 1. — The projection of a point upon a plane is the foot of a perpendicular let fall from the point upon the given plane. NOTE 2. — The line which projects a... | |
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The projection of a point upon a plane is the foot of the perpendicular from the point to the plane. 
