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2r = t
misal t & r = x
2r × t = x2
2. phi. r .t = 78.5
x2. phi = 78.5
x2 = 78,5 / 3.14
x2 = 25
X = 5 cm
jadi diameter dan tingginya = 5 cm
r = 5/2 = 2,5
Volume = phi. r2. t
= 3,14 x 2,5 x 2,5×5
= 98,125 cm