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 432
Thus in the above figure the line ab is the projection of the lineAB on the plane PQ. Note. It will be proved hereafter (see page 446) that the pro-jection of a straight line on a plane is also a straight line. DEFINITIONS. 411 4. The inclination of a straight line to a plane is theacute angle… … Thus in the above figure, if from any point X in the givenstraight line AB, which intersects the plane PQ at A, a perpen-dicular Xx is let fall on the plane, and the straight line Axb is drawnfrom A through x, then the inclination of the straight line AB to theplane PQ is measured by the acute…
Geometry · Mathematics
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