**Definition of Dimensions**

- Dimensions are used to describe the size and shape of an object. For example: length, width, height, etc.

**More about Dimensions**

- Length and width are the dimensions of a two-dimensional figure.
- Length, width, and height are the dimensions of a three-dimensional figure.

**Example of Dimensions**

- `The dimensions of a rectangle are 4m x 2m` implies that the `length of the rectangle is 4m and its width is 2m`.

**Solved Example on Dimensions**

Laura drew a trapezoid with dimensions as shown in the figure. Find the perimeter of the trapezoid.

Choices:

A. 23 cm

B. 21 cm

C. 24 cm

D. 22 cm

Correct Answer: A

Solution:

Step 1:The perimeter of a figure is the sum of all its side-lengths.

Step 2:The side-lengths of the trapezoid are 3 cm, 3 cm, 6 cm and 11 cm.

Step 3:The perimeter of the trapezoid = 3 + 3 + 6 + 11 = 23 [Add.]

Step 4:The perimeter of the trapezoid that Laura drew is 23 cm.

**Related Terms for Dimensions**

- Height
- Length
- Measurements
- Width