Given triangle ABC, which equation could be used to find the measure of â C? right triangle ABC with AB measuring 6, AC measuring 3, and BC measuring 3 square root of 5 cos mâ C = 2 square root of 5 all over 5 sin mâ C = square root of 5 over 5 cos mâ C = square root of 5 over 2 sin mâ C = 2 square root of 5 all over 5