Recent content by a sad student

Thank you guys for the replies! I've tried to expand on the problem a bit more, but I'm having trouble coming up with an additional equation to solve it (?). I also think that the angles should be equal but I'm having a hard time coming up with a proof for it. Here's my work (sorry it's a bit of...

My work so far is pretty basic, but I'm not too sure how to continue off from here. I haven't included the 2 dimensional aspect of it either, but I would presume that the rate of decrease in length is more sped up in that case? Would appreciate any help :(