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How can I use a scalar projection to show that the distance from a point}\end{Maple Normal}

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\mapleinline{inert}{2d}{P[1](x[1], y[1])}{$\displaystyle P_{{1}} \left( x_{{1}},y_{{1}} \right) $}
to the line ax+by+c=0 is:}\end{Maple Normal}

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\mapleinline{inert}{2d}{Typesetting:-mrow(Typesetting:-mfrac(Typesetting:-mfenced(Typesetting:-mrow(Typesetting:-mo("&VerticalBar;", mathvariant = "normal", fence = "false", separator = "false", stretchy = "false", symmetric = "false", largeop = "false", movablelimits = "false", accent = "false", lspace = "0.2777778em", rspace = "0.2777778em"), Typesetting:-mi("a", italic = "true", mathvariant = "italic"), Typesetting:-mo("&sdot;", mathvariant = "normal", fence = "false", separator = "false", stretchy = "false", symmetric = "false", largeop = "false", movablelimits = "false", accent = "false", lspace = "0.0em", rspace = "0.0em"), Typesetting:-msub(Typesetting:-mi("x", italic = "true", mathvariant = "italic"), Typesetting:-mrow(Typesetting:-mn("1", mathvariant = "normal")), subscriptshift = "0"), Typesetting:-mo("+", mathvariant = "normal", fence = "false", separator = "false", stretchy = "false", symmetric = "false", largeop = "false", movablelimits = "false", accent = "false", lspace = "0.2222222em", rspace = "0.2222222em"), Typesetting:-mi("b", italic = "true", mathvariant = "italic"), Typesetting:-mo("&sdot;", mathvariant = "normal", fence = "false", separator = "false", stretchy = "false", symmetric = "false", largeop = "false", movablelimits = "false", accent = "false", lspace = "0.0em", rspace = "0.0em"), Typesetting:-msub(Typesetting:-mi("y", italic = "true", mathvariant = "italic"), Typesetting:-mrow(Typesetting:-mn("2", mathvariant = "normal")), subscriptshift = "0"), Typesetting:-mo("+", mathvariant = "normal", fence = "false", separator = "false", stretchy = "false", symmetric = "false", largeop = "false", movablelimits = "false", accent = "false", lspace = "0.2222222em", rspace = "0.2222222em"), Typesetting:-mi("c", italic = "true", mathvariant = "italic"), Typesetting:-mo("&VerticalBar;", mathvariant = "normal", fence = "false", separator = "false", stretchy = "false", symmetric = "false", largeop = "false", movablelimits = "false", accent = "false", lspace = "0.2777778em", rspace = "0.2777778em")), mathvariant = "normal"), Typesetting:-mrow(Typesetting:-mi(""), Typesetting:-mrow(Typesetting:-mi(""), Typesetting:-msqrt(Typesetting:-mrow(Typesetting:-msup(Typesetting:-mi("a", italic = "true", mathvariant = "italic"), Typesetting:-mrow(Typesetting:-mn("2", mathvariant = "normal")), superscriptshift = "0"), Typesetting:-mo("+", mathvariant = "normal", fence = "false", separator = "false", stretchy = "false", symmetric = "false", largeop = "false", movablelimits = "false", accent = "false", lspace = "0.2222222em", rspace = "0.2222222em"), Typesetting:-msup(Typesetting:-mi("b", italic = "true", mathvariant = "italic"), Typesetting:-mrow(Typesetting:-mn("2", mathvariant = "normal")), superscriptshift = "0")))), Typesetting:-mi("")), linethickness = "1", denomalign = "center", numalign = "center", bevelled = "false"), Typesetting:-mo(" ", mathvariant = "normal", fence = "false", separator = "false", stretchy = "false", symmetric = "false", largeop = "false", movablelimits = "false", accent = "false", lspace = "0.0em", rspace = "0.0em"), Typesetting:-mtext("??????", mathvariant = "normal"), Typesetting:-mi(""))}{$\displaystyle \frac{\left(\mid a \cdot x _{1}+b \cdot y _{2}+c \mid \right)}{\sqrt{a ^{2}+b ^{2}}}\mathop{\rm  }$}
\mapleinline{inert}{2d}{}{$\displaystyle $}
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\mapleinline{inert}{2d}{}{\[\displaystyle \]}
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