Rectangle Perimeter
About this exercise
The perimeter of a rectangle.
Example problems
A few of the problems this exercise asks. The printable worksheet holds ten fresh ones.
- a = 19 cm b = 20 cm
- a = 10 cm b = 2 cm
- a = 3 cm b = 5 cm
- a = 4 cm b = 10 cm
Try it yourself first — open a section below only if you get stuck.
How to solve it
Add the length and the width, then double the result, since each appears twice.
Worked example
A rectangle 8 by 3 has a perimeter of (8 + 3) x 2 = 22.
Common mistake
Forgetting to double. Adding the two sides once gives only half the way round.