k so uh
legs are usually as long as the waist to the head (of course, differs between people)
around the halfway point, maybe a bit below, is where the knee is located, seperating the thigh from the lower leg (looked it up, apparently the lower part of you leg is called the crus????)
thighs usually store fat, meaning they're wider than the [crus], also the femur is pretty big so there's that..