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