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Math Help - find the distance of the point form the line

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    find the distance of the point form the line

    point (3,-1,-1),and line is through the points (1,0,-2) and (2,1,-1). We are told to use distance= [(A − P) u]/[u]. But why do we use cross product here rather than dot product?Thanx
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    Hello,

    Quote Originally Posted by Jojo123 View Post
    point (3,-1,-1),and line is through the points (1,0,-2) and (2,1,-1). We are told to use distance= [(A − P) u]/[u]. But why do we use cross product here rather than dot product?Thanx
    Because the distance from a point to a line is defined as being the length of the perpendicular line to the line and starting at the point..
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