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 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

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.

     example of  Dimensions
    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.