- Al × b
- B
- C4 × s
- Dl + b
Step-by-Step Solution
A rectangle has two lengths and two breadths, so perimeter = l + b + l + b = 2 × (l + b).
Answer: B)
The perimeter of a rectangle is found by which formula?
Class 6MensurationMensuration
Key idea: Perimeter shortcuts for special shapes
**Rectangle**: opposite sides are equal, so perimeter = l + b + l + b = 2(l + b).
**Square**: all four sides equal, so perimeter = 4 × s.
**Equilateral triangle**: all three sides equal, perimeter = 3 × s.
**Regular polygon with n sides of length s**: perimeter = n × s.
These shortcuts are just 'add the sides' written shorter.
**Square**: all four sides equal, so perimeter = 4 × s.
**Equilateral triangle**: all three sides equal, perimeter = 3 × s.
**Regular polygon with n sides of length s**: perimeter = n × s.
These shortcuts are just 'add the sides' written shorter.
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