directed line segment   2 videos

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  Angle Inclination of a Line

  Trigonometry Advanced Trigonometry

  How to find the angle of inclination of a line.

  angle inclination horizontal lines tangent slope
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  Distance Formula

  Trigonometry Pythagorean Theorem

  How to derive the equation for the distance between two points using the Pythagorean Theorem.

  distance coordinate plane ordered pair segment