Nov. 4 Distance Between A Point And A Line
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Transcript of Nov. 4 Distance Between A Point And A Line
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Finding the Distance Between a point and a Line
To find the perpendicular distance (which is also the shortest distance) between a point and a line.
Where the point is P(x1, y1)
and the equation of the line in standard form is
Ax + By + C = 0
The distance is d = Ax1 + By1 + C
A2 + B2
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Example
Find the shortest distance between the point
P(1, 2)
and the line 5x + y 1 = 0
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Example
Find the shortest distance between (3, 4) and the line 2x 5y = 7
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For the lines x + 3y = 6 and x + 3y = 3
Find the
a) Horizontal distance between the linesb) Vertical distance between the linesc) Shortest distance between the lines
First, what is the slope of each of the lines and what does this tell us about the lines?
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