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Homework Help: Scalar projection - finding distance between line and point

  1. Jan 21, 2012 #1
    Using a scalar projections how do you show that the distance from a point P(x1,y1) to line
    ax + by + c = 0 is

    [itex]\frac{|ax1 +b y1 + c|}{\sqrt{a^2 +b^2}}[/itex]

    I do not know how to approach this, please provide some guidance.
  2. jcsd
  3. Jan 21, 2012 #2


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    Find a normal vector ##\hat n## to the line and a vector ##\vec V## from some point on your line to your given point and think about projections.
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