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Angles Between Lines Warm Up:
By the end of the day you should be able to… Find the angle of inclination of a line Find the angle between two lines TS: Explicitly assessing information & drawing conclusions Warm Up: What was the formula for tan(x – y) again? (You have notes & I have books so you should be able to find it somewhere if it’s not still engrained in the brain.)
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Angle of Inclination y x
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Example: Find the angle of inclination for the line 2x – y + 3 = 0
Find the equation of the line with a y-intercept of 3 and an angle of inclination of 3π/4
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Angle Between Two Lines
y x
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Example: Find the acute angle formed by the lines x + 3y = 4 and x – 4y + 3 = 0
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Finding the angles of the triangle
(2, 3) (4, 3) (-1, -5)
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