Pre-calculus help. Please? :(

[ixchel.mn]

I am just starting pre-calculus, and I am having troubles on my project for the first bimester. >:

I really have no excuse for these two problems except that i really do not understand. D:

Any help, hints, whatever. Is incredibly welcome.

 

[tkhunny]

Follow the construction very carefully. Note: ABC is an Equilateral Triangle. There are not too many places to center an inscribed circle.

It's a LINEAR polynomial. P(x) = a*x + b

P(6) - P(2) = (6a+b) - (2a+b) = 4a = 12

Now what?