The perimeter and length of a rectangle are 40 m and 12

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The perimeter and length of a rectangle are 40 m and 12 m respectively. Its breadth will be

Using Rule 9,
Perimeter of rectangle = 40 metre
Length = 12 metre
∴ 2(l + b) = 40
⇒ 2 (12 + b) = 40

⇒ 12 + b =	40	= 20
	2

⇒ b = 20 – 12 = 8 metre