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
lar 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 angle BAb. In other words :— The inclination of a straight line to a plane is the acute anglecontained by the given straight line… … Note. It is proved in Proposition 3 that the common section oftwo planes is a straight line. Thus AB, the common section of the two planes PQ, XY is provedto be a straight line. 412 EUCLIDS ELEMENTS. 6. One plane is perpendicular to another plane whenany straight line drawn in one of the planes…
Geometry · Mathematics
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