Answer: (1/2) P l.
- A (1/2) P l
- B P × l
- C P + l
- D 2Pl
Correct answer: A. (1/2) P l
Explanation: Lateral SA of pyramid = (1/2) × perimeter of base × slant height = (1/2)Pl.
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