7. How much iron is needed to make a rod of length 90 cm and diameter 1.4 cm?
(3 Points)
(A) 137.5 CC
(B) 173.5 CC
(C) 138.6 CC
(D) 183.6 CC
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138.6 cm³ iron is needed to make a rod of length 90 cm and diameter 1.4 cm.
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