Save guides, add subjects and pick up where you left off with your BBC account. The area of the base is \(5 \times 5 = 25~cm^2\) The area of each triangular face is \((5 \times 6) \div 2 = 15~cm^2\).

Save guides, add subjects and pick up where you left off with your BBC account. The surface area of a cuboid can be calculated by adding together the areas of the six faces. The opposite faces of ...