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.
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.
Quick Summary
- Dimensions describe the size and shape of objects.
- Length and width are dimensions of a two-dimensional figure.
- Length, width, and height are dimensions of a three-dimensional figure.
🍎 Teacher Insights
Use real-world examples to illustrate dimensions. Have students measure objects in the classroom.🎓 Prerequisites
- Basic arithmetic
- Understanding of geometric shapes
Check Your Knowledge
Q1: What are the dimensions of a rectangle with length 4m and width 2m?
Q2: A cube has dimensions length, width, and height. How many dimensions does it have?
Frequently Asked Questions
Q: What are the dimensions of a square?
A: A square has two dimensions: length and width. Since all sides are equal, length and width are the same.
Q: How many dimensions does a circle have?
A: A circle is a two-dimensional figure with radius and diameter.