Holy crap! This has trigonometry in it! According to mathisfun.com! Haha! I got some homework to do!SOHCAHTOA!
Tan(b)=c/a (opposite over adjacent)
C=a*tan(b)
Mr. D was right, I would use this
There are plug and play Trig calculators all over the internet. https://www.carbidedepot.com/formulas-trigright.asp