help on determining angle plz!

I am building a wedge sub enclosure that is to fit behind my bench seat in my 1983 Chevy Scottsdale pickup.

How do I figure the angle for the slanted front piece of the box? I know it involves cosine, but I can't remember the formula. I've gone as far as asking geometry teachers, searching in books and even college notes, and I can't believe I can't find this.

If you need more info, let me know.

Anyhelp would be great. Thanks a lot. Jake

Jake,

 Hi, I'm waay out of school and not the brightest bulb in the trashcan, but I think I remember a thing or two about basic geometry. I wish there was a doodle pad on this forum to assist us. Your question is about figuring out the angle of the front piece of a wedge shaped box. Now, do you know any of the other dimentions or angles? And when you say a wedge, do you mean a basic triangle or a kind of rectangle with a triangle attached to it (like a 4 or 5 sided shape?)  If your box is square for the most part, just break the pattern up into the rectangles and triangle that make it up and remember that a triangles 3 angles add up to 180 deg. I might be thinking way too basic here but as I said before, I'm oldschool.  I hope this helped a little, if not, hey, I tried.

Basic trigonometry can be a life saver sometimes.