Hello,

I am here reviewing for my exam tmw.. this question I can't figure out - pease help.

Two triangular building lots, ABC and ACD, have side AC in common.

(in attachment)

a) Determine an exact expression for the side length of side AC

b) Determine an exact expression for the length of side AB

I get confused from the beginning because I don't know which trig ratio to solve with? (Sin/Tan or Cos?)