Answer: 14 cm.
- A 7 cm
- B 14 cm
- C 22 cm
- D 11 cm
Correct answer: B. 14 cm
Explanation: C = πd = 44. d = 44 × 7/22 = 14 cm.
Three standard 3D solids and their key formulas: a cylinder's volume scales with the full height, a cone's volume is exactly one-third of the cylinder with the same base and height, and a sphere's volume and surface area both follow distinct r-based formulas worth memorising separately.
Concept context
Perimeters, areas, and volumes of 2D and 3D shapes