Posted by jessica on .
A traditional unit of length in Japan is the ken (1 ken = 1.97 m). What is the volume of a cylindrical water tank of height 7.17 kens and radius 6.21 kens in cubic kens
V = pi*r^2 * h.
V = 3.14*(6.21)^2 * 7.17 = 868 kens^3.