Sstrhsrtj

documentclass[tikz,border=10pt]{standalone}

usepackage{tikz}

usetikzlibrary{calculations}

begin{document}    



begin{tikzpicture}

    coordinate (A) at (0,0);

    coordinate (B) at (2,5);

    coordinate (C) at (7,0);



    % Is this possible?

    % From point C to the direction of point A with the length of

    % from point A to point B

    % coordinate (D) at ($(C)!(A)!(A)-(B)$);

    % or

    % From point C to the direction of 60 degrees with the length of

    % from point A to point B

    % coordinate (D) at ($(C)!(60)!(A)-(B)$);



    draw (A)--(B)--(C)--cycle;

end{tikzpicture}



end{document}

documentclass[tikz,border=10pt]{standalone}

usepackage{tikz}

usetikzlibrary{calculations}

begin{document}    



begin{tikzpicture}

    coordinate (A) at (0,0);

    coordinate (B) at (2,5);

    coordinate (C) at (7,0);



    % Is this possible?

    % From point C to the direction of point A with the length of

    % from point A to point B

    % coordinate (D) at ($(C)!(A)!(A)-(B)$);

    % or

    % From point C to the direction of 60 degrees with the length of

    % from point A to point B

    % coordinate (D) at ($(C)!(60)!(A)-(B)$);



    draw (A)--(B)--(C)--cycle;

end{tikzpicture}



end{document}

documentclass[tikz,border=10pt]{standalone}

usepackage{tikz}

usetikzlibrary{calculations}

begin{document}    



begin{tikzpicture}

    coordinate (A) at (0,0);

    coordinate (B) at (2,5);

    coordinate (C) at (7,0);



    % Is this possible?

    % From point C to the direction of point A with the length of

    % from point A to point B

    % coordinate (D) at ($(C)!(A)!(A)-(B)$);

    % or

    % From point C to the direction of 60 degrees with the length of

    % from point A to point B

    % coordinate (D) at ($(C)!(60)!(A)-(B)$);



    draw (A)--(B)--(C)--cycle;

end{tikzpicture}



end{document}

documentclass[tikz,border=10pt]{standalone}

usepackage{tikz}

usetikzlibrary{calculations}

begin{document}    



begin{tikzpicture}

    coordinate (A) at (0,0);

    coordinate (B) at (2,5);

    coordinate (C) at (7,0);



    % Is this possible?

    % From point C to the direction of point A with the length of

    % from point A to point B

    % coordinate (D) at ($(C)!(A)!(A)-(B)$);

    % or

    % From point C to the direction of 60 degrees with the length of

    % from point A to point B

    % coordinate (D) at ($(C)!(60)!(A)-(B)$);



    draw (A)--(B)--(C)--cycle;

end{tikzpicture}



end{document}

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