Answer: 11 cm.
- A 11 cm
- B 22 cm
- C 44 cm
- D 7 cm
Correct answer: A. 11 cm
Explanation: Arc length = (θ/360°) × 2πr = (45/360) × 2 × (22/7) × 14 = (1/8) × 88 = 11 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