A cuboid is a solid with 6 rectangular faces.

A **cuboid** is made up of 6** rectangles**.

The area of a rectangle is obtained by = L×W

Surface area of a cuboid is given by adding up the areas of the** six rectangles.**

**= L × W + L × W + L × W + L × W + L × W + L × W**

SA of a Cuboid is given by:

#### Activity 1

Attempt to answer the question given here before moving on.

A cuboid measures 30 cm by 10 cm by 8 cm. Calculate it's total surface area.

#### Solution 1

#### Activity 2

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The length of an open cuboid is 65 mm. it's width is 4 cm and it's height is 6 cm. Find it's total surface area in cm.

#### Solution 2

Study the solution below and compare with your own work

#### Activity 3

Attempt to answer the question below before moving on.

A house which has a cement flat roof top measures 18m long, 10mm wide and 8m high. Find the surface area of the walls without the roof.

#### Solution 3

Study the solution below and compare your own work to the solution provided

#### Watch this video to revise all we have learned in this topic.

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- surface_area_cuboid by eLimu used under CC_BY
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