Area of Rectangle and Square
Length times width.
Key idea
Length times width.
In depth
Area counts how many unit squares cover a shape. A rectangle with length l and width w has area lw because it has w rows of l squares. A square is the case l = w, so A = s².
Worked example
A 6 m by 4 m floor has area 24 m². A square of side 5 has area 25.
Formula
Real-world uses
- Estimating carpet, paint or tile needs for a room
- Sizing a garden plot
Common mistake
Writing the answer in linear units instead of square units.
How to learn this
- Read the key idea and say it in your own words.
- Work through the worked example, then try a similar problem.
- Use the interactive lesson’s visual and mini-quiz to check the pattern.
Frequently asked questions
What is Area of Rectangle and Square?
Length times width. It is a topic at the beginner level in Geometry.
What is the formula for Area of Rectangle and Square?
The key formula is A = l × w.
Where is Area of Rectangle and Square used in real life?
Real-world examples: Estimating carpet, paint or tile needs for a room; Sizing a garden plot.
What should I learn before Area of Rectangle and Square?
Make sure you are comfortable with Perimeter, the previous topic in Geometry.
What is a common mistake with Area of Rectangle and Square?
Writing the answer in linear units instead of square units.
How can I practise Area of Rectangle and Square?
Open the interactive lesson, play with the visual, then answer the three-question mini-quiz. Getting two right marks the topic complete.
What comes after Area of Rectangle and Square?
Move on to Area of Parallelogram next.
Related beginner topics in Geometry
- Points, Lines and Planes – The undefined building blocks of geometry.
- Line Segments and Rays – A segment has two endpoints; a ray starts at a point and goes on forever.
- Angles – Two rays sharing an endpoint; measured in degrees.
- Types of Angles – Acute <90°, right 90°, obtuse between 90° and 180°, straight 180°.
- Measuring Angles with a Protractor – Align the baseline and read the scale.
- Complementary and Supplementary – Pairs summing to 90° or 180°.