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Perimeter = 2L + 2b
or 2( L + b)
or 2 (L + W)
Where L = Length
b/W = Breadth / Width
Example 1:
The length of a rectangular room is 8m, and the width (breadth) is 6m. Find the perimeter of the room.
Solution:
Length of the room, L = 8m
Width of the room, W = 6m
Perimeter = 2 (L + W)
Perimeter = 2(8 + 6)
= 2 × 14
= 28m
Example 2:
A rectangle is 5m long and 2000mm wide. Find the perimeter.
Solution:
First, convert to the same unit, so we will convert millimetre to metre. Remember there are 1000 millimetres in 1 metre.
Width (w) = 2000mm
= 2000 ÷ 1000
= \( \frac{2000}{1000} \)
Width = 2m
Length (l) = 5m
Perimeter = 2 (L + W)
= 2 × (5 + 2)
= 2 × 7
Perimeter = 14m
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