What is the polar form of (x+3)^2+y^2=9

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?

Which angle has the same measure as the dehedral angle formed by the orange face and the purple rectangle

If cos(θ)=2853 with θin q iv, what is sin(θ)?