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The perimeter of a square = 4s Area of...

The perimeter of a square = 4s
Area of a square = `s xx s`
Perimeter of a rectangle = `2 (l + b)`
Area of a rectangle = `l xx b`
If length is thrice of the breadth of a rectangular hall. Find the perimeter of the rectangle.

A

3b units

B

21 units

C

412 units

D

8b units

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