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 453
I. 33. And because BC is equal and par1 to EF, .-. CF is equal and par1 to BE. I. 33. Hence AD and CF, being each equal and par1 to BE, are equal and par1 to one another; Ax. 1 and XI. 9. hence it follows that AC is equal and par1 to DF. I. 33. Then in the A3 ABC, DEF,because AB, BC, AC = DE, EF,… … XY Let A be the given point outside the plane XY.It is required to draw from A a st. line perp. to the plane XY. Draw any st. line BC in the plane XY ; and from A draw AD perp. to BC. I. 12. Then if AD is also perp. to the plane XY, what was required is done. But if not, from D draw DE in the…
Geometry · Mathematics
Internet Archive · UBC Library · Public Domain Mark 1.0. Free to use for anything.
