Woods, Frederick S. (Frederick Shenstone), 1864-, Bailey, Frederick H. (Frederick Harold), 1865- · Boston, New York [etc.] Ginn and Company · leaf 79
ough (§, — 3), with the slope f^.Its equation is y + 3 = & (x - |), or 10 x - 32 y - 121 = 0. Fm G2 THE STRAIGHT LINE 4. Angle between two lines. Let AB and CD (fig. 69) inter-sect at the point P, making the angle BPD, which we shallcall /3. Draw the line PR parallel to OX, and place BPB =… … 1 + m^ If <£>2 is always takengreater than c^, tan /3 willbe positive or negativeaccording as /? is acuteor obtuse. Ex. 4. Find the acute angle between the two lines 2a:-3?/ + 5 = 0 and x + 2y+2 = 0. Since the second line makes the larger angle with OX, we jilacem%=- |, mx = $. Then, by…
Geometry, Analytic · Calculus
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