Aldis, W. Steadman (William Steadman), 1839-1928 · Cambridge [Eng.] Deighton, Bell, and co.; London, G. Bell and sons · leaf 22
of the distances travelled by the foot of theperpendicular, or of the projections of PR, RS, SQ. Thesame theorem will be obviously true if instead of three lineswe have any number. By the angle between PR and ABis meant the angle which would be formed if from any pointwere drawn lines in the… … INTRODUCTORY THEOREMS. 13 If, in the figure of that Article, QN be drawn parallelto the axis of z to meet the plane of oci/ in N, and jS3I drawnparallel to Oy to meet Ox in M, it follows that the pro-jection of OQ on OP is equal to the sum of the projectionsof OM, J\m and A^Q on OP, that is, if 6…
