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The first 20 digets after the dot in pi are: 3.14159265358979323846
Pi = 3.1415926535897932384 (to 19 d.p. or 20 s.f.)
C = 2(pi)r C = 2(pi)20 C = 40(pi) C = 125.6 in
Circumference = (pi) x (diameter) Diameter = Circumference/pi 62.8/pi = 19.98986 (rounded) which is awfully close to 20.
17d and 20 height v=pi r r h v=pi 8.5 8.5 20 v=pi 72.25 20 v=1445pi