A cuboid of size 100 cm × 80 cm × 60 cm cut into eight identical parts by three cuts. What is the total surface area (in square cm.) of all the eight parts?

75200

We know that,

Total surface area of cuboid = 2(lb + bh + hl)

The cuboid is cut from the middle of each face to get 8 identical cuboids

Total surface area of each small cuboid = 2(50 × 40 + 40 × 30 + 30 × 50) = 2× 4700 = 9400

Total surface area of 8 small cuboids = 8 × 9400 = 75200