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

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  1. V = pi*r^2 * h.
    V = 3.14*(6.21)^2 * 7.17 = 868 kens^3.

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