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44 cm = 22/7d
d = 44 : 22/7
d = 14 cm
b. r = d : 2
= 14 cm : 2 = 7 cm
c. L = 4πr²
= 4 x 22/7 x 7 cm x 7 cm
= 616 cm²
d. V = 4/3πr³
= 4/3 x 22/7 cm x 7 cm x 7 cm x 7 cm
= 1437,33 cm³