Drawing triangles in latex

Question

newcommand{length}{4}
    newcommand{width}{4}
    begin{tikzpicture}
       
       %Coordinates for square 
       coordinate (O) at (0,0);
       coordinate (A) at (length,0);
       coordinate (B) at (0,width);
       coordinate (C) at (length,width);

%Drawing square
       draw (O) -- (A) -- (C) -- (B) -- cycle;

foreach x in {0.1,4.1}{
          foreach y in {width-0.1, -0.1}{
             draw (x,y) -- (x,y-1.2) -- (x+0.4,y-1.2+0.9) -- cycle;
           }
        }
        
        foreach x in {0.1,length + 0.1}{
           foreach y in {- 0.1, width  - 0.1}{
              draw (x,y) -- (x+1.2,y) -- (x+1.2-0.9,y-0.4) -- cycle;
           }
        }

end{tikzpicture}

This is the code which i used to draw two similar triangles as shown in figure. But the two triangles overlap(slightly) which should not happen. What can i do for that?

KersouMan · Accepted Answer

I post this as an answer as it is too long for a comment.
Your triangles overlap because the third coordinate of each blue triangle is not the third coordinate of the corresponding red triangle.
Then, you have to change the 0.4 into a 0.3.
Moreover, I took the liberty to clean the code a bit and to suggest a modification as to how to draw the triangles.
Indeed, by drawing them separately, you will end up with a protrusion to the top left of each of your triangle shapes (that is present on the picture in the question).
Then, I propose to first fill the triangle shapes and then to draw the encompassing shape:
documentclass{standalone}

usepackage{tikz}

begin{document}

newcommand{length}{4}
    newcommand{width}{4}
    
    begin{tikzpicture}
        
        % Draw square if coordinates are needed, which is not the case here
%       draw (0, 0)                coordinate (O)
%               -- ++ (length, 0)  coordinate (A)
%               -- ++ (0, width)   coordinate (C)
%               -- ++ (-length, 0) coordinate (B)
%               -- cycle;

% Draw square simply
        draw (0, 0) rectangle (length, width);

foreach x in {0, length}{
            foreach y in {width, 0}{
                % Draw blue triangles 
                fill[blue] (x + 0.1, y - 0.1) -- ++ (0, -1.2) -- ++ (0.3, 0.9) -- cycle;
                % Draw red triangles
                fill[red] (x + 0.1, y - 0.1) -- ++ (1.2, 0) -- ++ (-0.9, -0.3) -- cycle;
                % Draw shape around
                draw (x + 0.1, y - 0.1) -- ++ (1.2, 0) -- ++ (-0.9, -0.3) -- ++ (-0.3, -0.9) -- cycle;
                % Draw line separating the triangles
                draw (x + 0.1, y - 0.1) -- ++ (0.3, -0.3);
            }
        }

end{tikzpicture}
   
end{document}

which yields:

Drawing triangles in latex

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