PLEASE HELLPP!! I'm doing a geometry project!!

[Mercy14]

I can't find squat on google [[which is abnormal]] so I decided to post on hereee.
I NEED HELPPP!!!
Anything will do.
Everything, really.
How geometry is involved with the shape of the bass, the strings, the wave lengths. All that jazz. lol
Yanno, how different frets produce different sounds and whatnot.
IT'S DUE IN TWO DAAAYYYSSS!!
Help mee! D:

thanks a ton!
-Amber