Answer: 198 cm³.
- A 66 cm³
- B 198 cm³
- C 154 cm³
- D 99 cm³
Correct answer: B. 198 cm³
Explanation: V = πr²h = (22/7) × 9 × 7 = 22 × 9 = 198 cm³.
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