Nevermind... got it.
I was looking over some websites that showed examples of optimization problems in hopes of getting better at them.
Here's the site.
http://tutorial.math.lamar.edu/Class...imization.aspx
I'm referring to example 5.
It says, "using basic right angle trig we can see that: L1 = 8secx and L2 = 10cscx"
How did they figure that out?