alleryStart learning →The normal form of the equation of a line at distance p from the origin is
Ax cosα - y sinα = p
Bx sinα + y cosα = p
Cx cosα + y sinα = p
Dx tanα + y = p
Answer & Solution
Correct answer: C. x cosα + y sinα = p
With the normal of length p making angle α with the X-axis, the line is x cosα + y sinα = p.
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