h = 8 m           V = 25104 L                Ř = ?

            V = AB · h

            25104 = AB · 8            ;             B = 25104 / 8 = 3138 m2

      AB = π · r2    ;  3138 = 3’14 · r2   ; r2 = 3138 / 3’14 = 999’36 m2

            r = 999’36 = 31’61 m

            Ř = 2 · r       ;    Ř = 31’61 · 2 = 63’22 m

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