Find the measure of angle C of a triangle ABC, if m∠A = α, m∠B = 2α

Atoy company is considering a cube or sphere-shaped container for packaging a new product. the height of the cube would equal the diameter of the sphere . compare the volume to surface area ratios of the containers. which packaging will be more efficient? for a sphere, sa =4πr²

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Triangle knm is what is true about the sides of knm