Perimeter is the total distance around the outside of a shape.
Perimeter = sum of all side lengths
- Rectangle: P = 2 x (length + width)
- Square: P = 4 x side
- Any shape: add up all sides
Perimeter • Topic 1 of 2
Find Perimeter by Adding Sides
Solved Examples
1
Worked Example
Rectangle: length 7 m, width 4 m. Find the perimeter.
SolutionP = 7+4+7+4 = 22 m. Or use formula: P = 2 x (7+4) = 2 x 11 = 22 m.
2
Worked Example
Square: side 9 cm. Find the perimeter.
SolutionP = 4 x 9 = 36 cm. A square has 4 equal sides.
3
Worked Example
Triangle: sides 3 cm, 5 cm, 6 cm. Find the perimeter.
SolutionP = 3 + 5 + 6 = 14 cm. Add all 3 sides.
Key Points
- Perimeter = total distance around the shape.
- Rectangle: P = 2x(L+W). Square: P = 4 x side.
- For any shape: just add up all side lengths.
Quick Check — 4 MCQs
Tap an option to check your answer0 / 4
Q1.Perimeter is the total distance:
Explanation: Around the boundary.
Q2.To find the perimeter, you ___ the lengths of all the sides.
Explanation: Add them.
Q3.A square of side $6$ has perimeter:
Explanation: $4\times6=24$.
Q4.Perimeter is measured in:
Explanation: Length units.