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]