Equation of the Normal Line at a Point

Is it normal to find a perpendicular line to the tangent line? The short video provides a problem to find the equation of the normal line to a function. Beginning with an explanation of the normal line, the 27th installment in a 31-part series on calculus finds the equation of the tangent line. Using the slope relationships between perpendicular lines, the resource then finds the equation of the normal line.

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Instructional Ideas

  • Review the relationship between the slopes of perpendicular lines
Classroom Considerations

  • Individuals should be comfortable finding the derivative of a function
  • Class members need to be able to find the equation of a line given the slope and a point on the line
Pros

  • Shows the graphic representation of the graph of the function, the tangent line, and the normal line
  • Includes closed captioning
Cons

  • None