Here, For the base of pyramid which is a rectangle, length(a) = 8m breadth(c) = 5m For the pyramid, actual height (h) = 6m Now, The formula for the Volume of a rectangular based pyramid is, 1/3 * Area of base rectangle * height = 1/3 * (a*c) * 6 [ Because area of rectangle is product of its two sides, length and breadth] = 2 * 8 * 5 80m^3