Dimensions
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 twodimensional figure.
 Length, width, and height are the dimensions of a threedimensional 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
Video Examples: SPM  Maths Form 4  Line and Plane in 3 Dimension (Fully Cover)
Solved Example on Dimensions
Ques: Laura drew a trapezoid with dimensions as shown in the figure. Find the perimeter of the trapezoid.
Choices:
A. 23 cmB. 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 sidelengths.
Step 2: The sidelengths 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.
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