The perpendicular distance from the origin of the perpendicular from the point (1, 2) upon the straight line .
Distance of a point from a line.
The equation of the line perpendicular to is
This line passes through (1, 2).
∴ + 2 + λ = 0
Substituting the value of λ, we get
Let d be the perpendicular distance from the origin to the line
Hence, the required perpendicular distance is
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