HOW CAN WE SAY THAT IN THE PLANE EQUATION ax+by+cz+d=0 a,b,c are the d.rs of the plane?

Dear Sreedhar,

For a given line, a set of direction numbers is a set of numbers a, b, c with the property that the ratios a:b:c are equal to the ratios p:q:r of the direction cosines.

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