# How do you find the surface area of a rectangular prism?

Rectangular prisms are six-sided solids, which are used for various practical purposes. They are also called cuboids.

## Answer: The surface area of a rectangular prism is 2(lw + wh + hl), where h is the height of the cuboid, w is the width and l is the length.

Let's understand the solution in detail.

**Explanation:**

In the above picture, the rectangular prism has 3 dimensions: Height(h), Length(l) and Width(w).

Hence, the total surface area of the prism, A = Area of the six faces.

⇒ A = 2 (Area of base + Area of two sides + Area of front and back faces)

⇒ A = 2 (lw + wh + hl)

Now, let l = 5, w = 10 and h = 15, then the area is A = 550 sq. units.

Check out the surface area calculator of a cuboid.