approximate number of complete cylindrical rods that can be formed – Discussion Forum

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Piyush365

Asked: October 5, 2026In: Class 9 Maths

A solid metallic cube of side 12 cm is melted and recast into solid cylindrical rods, each having radius 2 cm and height 12 cm. Find: (i) The volume of the cube. (ii) The volume of one cylindrical rod. (iii) The approximate number of complete cylindrical rods that can be formed.

(i) Cube volume is 12³ = 1728 cm³. (ii) Rod volume is (22/7) × 2² × 12 = 1056/7 ≈ 150.86 cm³. (iii) Number of complete rods is 1728 ÷ (1056/7) = 11.45, giving 11 complete rods. Class 9 Chapter 14 ...