Surface Area of Cuboid

We know that surface of a cuboid consists of six rectangular faces.

The sum of the areas of six rectangular faces is called the surface area of the cuboid.

Let the length, depth or breadth, and height(in cm) of a cuboid be l, b, and h respectively. Here are surface area of cuboid formula:

Example1. Find the area of the cardboard require to make a closed box to length 12 cm, breadth 10 cm, and height 7 cm.

Solution: Here l = 12 cm, b=10 cm, h = 7 cm

As we know, surface area = 2(lb + bh + hl)1²

= 2(12 x 10 + 10 x 7 + 7 x 12) cm²

= 2(120 + 70 + 84) cm²

= 2 x 274 cm²

= 548 cm²