Bailey, Frederick H. (Frederick Harold), 1865- · Boston, London, Ginn & Co. · leaf 30
byTrigonometry, p;p;=op;+op/—20P1.OP2COS (^1—^2); .. if the length of P1P2 is denoted by d, d = Vri^ + r2- - 2rir2 cos {6^ — 6^). (1) Draw PjRjand P2R2 perpendicular to OM, and P2S perpen-dicular to PiRi- Then, if we detine the slope as the tangentof the angle the line makes with OM, it is evident… … Fig. 12. Let the vertices of the triangle be Pi (ri, ^1), P2 (ro, B^, andP3 (3, ^3). Connecting the origin with the vertices of thetriangle, we shall form three triangles, P1OP2, PaOPj, PsOPi, 16 PLANE ANALYTIC GEOMETRY. such that area of PiPoPs^area of PiOPa + areaof P2OP;area of P3OP1.By…
Geometry, Analytic
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