Text-book of Euclid's elements for the use of schools : books I - VI and XI (1900)
Hall, H. S. (Henry Sinclair), 1848-1934, Stevens, F. H. (Frederick Haller), 1853-1933 · MacMillan : London · leaf 455
are equally inclined to the plane. 2. Find the locus of the foot of the perpendicular drawn from agiven point upon any plane which passes through a given straightline. 3. From a given point A a perpendicular AF is drawn to a planeXY ; and from F, FD is drawn perpendicular to BC, any line inthat… … X Case I. Let the given point A be in the given plane XY;and, if possible, let two perps. AB, AC be drawn from A tothe plane XY. Let DF be the plane which contains AB and AC ; andlet the st. line DE be the common section of the planes DFand XY. XL 3 Then the st. lines AB, AC, AE are in one plane.…
Geometry · Mathematics
Internet Archive · UBC Library · Public Domain Mark 1.0. Free to use for anything.
