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t = 14 cm
v.tabung = l.alas × t
v.tabung = 22/7 × r^2 × 14
r^2 = 2156 : (22/7 × 14)
r^2 = 49
r = 7 cm
l permukaan tabung = 2 × luas lingkaran
luas p. tabung = 2 × 22/7 × 7 × × 7
l. permukaan = 308 cm2