Free crown for anyone who can solve this what smells like fish when its alive and when its dead

Will used 20 colored tiles to make a design in art class. 5/20 of his tiles were red. what is an equivalent fraction for the red tiles?

52 cm radius = diameter = area = circumference = circumfer

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.