Does anyone know the answer to this? thank you!

Evaluate cos2θ for cosθ = square root of 3/2

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why? a. point c could be the interior of aob but it is not the only case b. point c is the interior of aob c. point c is not the interior of aob d. the given is not possible for the plane geometry answer