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 468
plane XY .*. they are par1. And since these par13 all intersect AB, .*. they are co-planar. xi. the point p is in the common section of the planes A&, XY ;that is, p is in the st. line ab.But p is any point in the projection of AB,.. the projection of AB is the st. line ab. q.e.d. xi. 6.… … Let AB and CD be the two straight lines, not in the same plane. (i) It is required to draw a st. line perp. to each of them. Through E, any point in AB, draw EF par1 to CD.Let XY be the plane which passes through AB, EF. From H, any point in CD, draw HK perp. to the plane XY. XI. 11.And through K,…
Geometry · Mathematics
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