Geometry: Angle between Two Lines Let and denote two
Chapter 8, Problem 107(choose chapter or problem)
Geometry: Angle between Two Lines Let and denote two nonvertical intersecting lines, and let denote the acute angle between and (see the figure). Show that where and are the slopes of and respectively. [Hint: Use the facts that and tan u ] 2 = m2 tan u . 1 = m1 L2 L , m1 m2 1 tan u = m2 - m1 1 + m1m2
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