Answer:
84 degrees.
Step-by-step explanation:
First, let's define what a complementary angle is. It's when two angles add up to 90 degrees. So we do 90-6=84 and 84+6 does in fact equal 90, so they are complementary.
A^2+B^2=C^2
(A)^2+(B)^2+(A)+(B)+2Cos(a)=C^2
