View source for User:Annoyingpi

<asy>
draw((0,0)--(5,12));
draw((5,12)--(8,12));
draw((0,0)--(13,0));
draw((5,12)--(5,0));
draw((8,12)--(13,0));
draw((8,12)--(8,0));
dot((5,12));
dot((8,12));
dot((13,0));
dot((0,0));
dot((5,0));
dot((8,0));
label("A",(5,12),NW);
label("B",(8,12),NE);
label("C",(13,0),SE);
label("D",(0,0),SW);
label("M",(5,0),S);
label("N",(8,0),S);
label("13",(2.5,6),NW);
label("13",(11.5,6),NE);
label("13",(6.5,-1),S);
label("3",(6.5,12),N);
label("12",(5,6),W);
label("12",(8,6),E);
label("5",(2.5,0),N);
label("5",(10.5,0),N);
</asy>