Area
The size of a surface!
Area is the amount of space inside the boundary of a flat object (such as a square or circle).
Example:
These shapes all have the same area of 9:
Area of Plane Shapes
There are special formulas for certain shapes:
Example: What is the area of this rectangle?
The formula is:
Area = w × h
w =width
h = height
The breadth is 5, and the height is 3, so we know w = 5 and h = 3. So:
Area = 5 × 3 = 15
Read Area of Plane Shapes for more information.
Finding Area by Counting Squares
You can count the number of squares to find an area.
This rectangle has an area of 15
If each square was 1 cm on a side, then the area would be 15 cm2 (15 square cm)
The squares may not match the shape exactly, so you will need to "approximate" an answer.
One way is:
- more than half a square counts as 1
- less than half a square counts as 0
Like this:
This pentagon has an area of approximately 17
Or just use your eyes and count a whole square when the areas seem to add up, like with this circle, where the area marked "4" seems equal to about 1 whole square (also for "8"):
This circle has an area of approximately 14