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Perimeter Theory
What is Perimeter?
The perimeter is the total distance around the edge of a 2D shape. It's like walking around the boundary of a park - the total path length is the perimeter.
Perimeter is measured in linear units like meters, centimeters, inches, or feet.
Real-life example: Fencing a yard, framing a picture, or trimming the edges of a rug.
Perimeter Formulas
Different shapes have different formulas for calculating perimeter:
Square Perimeter
A square has all four sides equal. To find its perimeter, simply multiply the length of one side by 4.
Example: A square with side length 5cm has perimeter = 4 × 5 = 20cm
Rectangle Perimeter
A rectangle has opposite sides equal. Add the length and width, then multiply by 2.
Example: A rectangle 6m long and 4m wide has perimeter = 2 × (6 + 4) = 20m
I have invited 14 guests for dinner. Help me arrange tables so they sit together with the fewest tables.
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Perimeter Challenges
Test your perimeter knowledge with these real-world challenges. Calculate the perimeter for each scenario and enter your answer.
Swimming Pool
A rectangular swimming pool measures 12 meters long and 8 meters wide. What is the perimeter of the pool?
Chess Board
A chess board is a square with each side measuring 45 cm. What is the perimeter of the chess board?
Shape Builder Workshop
Build Your Shape
Step 1: Select a shape type
Step 2: Adjust dimensions using sliders
Step 3: Calculate the perimeter and check your answer!