What is the total surface area?
A normal-level "Area" problem.For surface area, do not count six separate faces — see three pairs of identical faces. The same view works for any prism.
GivenA cuboid 5 cm wide, 3 cm deep and 4 cm high
Hints
- There are six faces, but opposite faces are exactly the same shape — so the same area. The blue front and back are the first such pair.
- The front face is 5 × 4 = 20 cm², and the back is the same — two of these.
- Next the top: 5 × 3 = 15 cm². The bottom matches — two more.
- Finally the right side: 3 × 4 = 12 cm², with the left to match. That is all six.
- Add the three and double: (20 + 15 + 12) × 2. Much faster and safer than counting six faces one by one.
Answer 94cm²
More "Area" problems
- Area of the inner triangle?
- Area of triangle DOA?
- Area of quadrilateral ABCD?
- Area of the overlap?
- Total area of the two crescents?
- Area swept by the square?