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22=2×22r×r
22×7=44
r=154/44
r=3,5
V=π×r²×t
=22/7×3,5²×12
=462cm³
22 = 22/7x 2r
22 / 22/7= 2r
22 x 7/22 = 2r
7 = 2r
r = 3,15 cm
V tabung = phi x r x r x t
= 22/7 x 7/2 x 7/2 x 12
= 11 x 42
= 462 cm kubik