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Erickson Carlson

04/02/2020 · High School

Angle Between Two Lines In this exercise we find a formula for the angle formed by two lines in a coordinate plane. (a) If \( L \) is a line in the plane and \( \theta \) is the angle formed by the line and the \( x \) -axis as shown in the figure, show that the slope \( m \) of the line is given by 

\( m = \tan \theta\) (b) Let \( L _ { 1 } \) and \( L _ { 2 } \) be two nonparallel lines in the plane with slopes \( m _ { 1 } \) and \( m _ { 2 } \) , respectively. Let \( \psi \) be the acute angle formed by the two lines (see the following figure). Show that 

\( \tan \psi = \frac { m _ { 2 } - m _ { 1 } } { 1 + m _ { 1 } m _ { 2 } }\) (c) Find the acute angle formed by the two lines 

\( y = \frac { 1 } { 3 } x + 1 \) and \( y = \frac { 1 } { 2 } x - 3\) 

Answer
expertExpert-Verified Answer

Lewis Ingram
Experienced Tutor
4.0 (40votes)

\(\text { (c) } 8.1 ^ { \circ }\)

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