Determine the value of ? in the figure below.

[asy]

size(4cm);

void mra(pair u, pair v, pair w, real r){

draw(v+(u-v)/length(u-v)*r--v+(u-v)/length(u-v)*r+(w-v)/length(w-v)*r--v+(w-v)/length(w-v)*r);

}



pair a=(-1,0); pair b=(0,0); pair c=(0,sqrt(24)); pair d=(5,sqrt(24));

draw(c--a--b--c--d--b);

mra(a,b,c,0.4);

mra(b,c,d,0.4);

label("1",(a+b)/2,S);

label("5",(a+c)/2,WNW);

label("5",(c+d)/2,N);

label("?",(b+d)/2,SE);

[/asy]



(It's LaTex, Im hoping I did this right)