Aldis, W. Steadman (William Steadman), 1839-1928 · Cambridge [Eng.] Deighton, Bell, and co.; London, G. Bell and sons · leaf 21
he projection of a line to be equalto its length multiplied by the cosine of the angle whichit makes with the second line, those angles being alwaystaken which are formed by the successive lines PR, RS, SQwith AB towards the same part. Thus if D come to theleft of C, the angle between RS and AB… … A DC 12 INTRODUCTORY THEOREMS. pasfi from one point to a second, is equal to the j^^ojectionon the same line, of the straight line joining the tiuo points. This statement may be illustrated thus. Suppose a pointto move from P to Q along PR, RS, SQ, and from eachof its successive positions imagine a…
