Area of a Rectangle
(KS3, Year 7)
The LessonThe area of a rectangle is found using the formula:
In this formula, b is the length of the base of the rectangle and h is the height of the rectangle. The image below shows what we mean by the length of the base and the height:
How to Find the Area of a RectangleFinding the area of a rectangle is easy.
QuestionWhat is the area of a rectangle with a base of 8 cm and a height of 5 cm, as shown below?
Start with the formula:
Area = bhDon't forget: bh = b × h
Substitute the length of the base and the height into the formula. In our example, b = 8 and h = 5.
Area = 8 × 5 = 40 cm2
Answer:The area of the rectangle with a base of 8 cm and a height of 5 cm is 40 cm2.
"Find the Area" Widget
- Click on the shape you're learning about.
- Click on the pad to start.
- Follow the instructions in the bottom-left corner.
- On the last click, the formula, workings, and answer will appear in the yellow box.
- Good luck!
Lesson SlidesThe slider below shows another real example of how to find the area of a rectangle. Open the slider in a new tab
What Is a Rectangle?A rectangle is a flat shape with four straight sides and four right angles. The opposite sides are parallel and of equal length. Adjacent sides are perpendicular and of unequal length.
A Note on UnitsThe area of a rectangle is a length times a length, so we say its dimension is length2. (All areas are lengths squared). This affects the units used. If the lengths of a rectangle are in cm, the area is in cm2. If the lengths are in inches, the area is in inches2.
- Do you disagree with something on this page?
- Did you spot a typo?