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 433
lines QP, QR are drawnperpendicular to AB, one in eachplane: then the inclination ofthe two planes is measured bythe acute angle PQ.R. Note. This definition assumes that the angle PQR is of constantmagnitude whatever point Q is taken in AB : the truth of whichassumption is proved in Proposition 10.… … DEFINITIONS. 413 8. Parallel planes are Buoh as do not meet when pro (lured. 9. A straight line is parallel to a plane if it does notmeet the plane when produced. 10. The angle between two straight lines which do notmeet is the angle contained by two intersecting straight linesrespectively parallel…
Geometry · Mathematics
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