Answer: (1/2)(a+b) × h.
- A (a+b) × h
- B (1/2)(a+b) × h
- C ab × h
- D (a-b) × h
Correct answer: B. (1/2)(a+b) × h
Explanation: Area of trapezoid = (1/2)(sum of parallel sides) × height = (a+b)h/2.
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