Question

A rectangle is of length l​ cm and breadth b​ cm. The length of the rectangle is decreased by 10​ cm and the breadth is doubled. What is the perimeter of the new rectangle?

Answer 1

Answer:

Therefore, the perimeter of the new rectangle is 2l - 20 + 4b.

Step-by-step explanation:

Length of the rectangle = l centimetres.

Breadth of the rectangle = b centimetres.

If length is decreased by 10 centimetres and the breadth is doubled, then:

New length = [l - 10]cm

New breadth = 2b cm

Formula: Perimeter of a rectangle = 2 [l + b]

Substituting the values for length and breadth

= 2 [ (l - 10) + (2b) ]

= 2 l - 20 + 4b

Therefore, the perimeter of the new rectangle is 2l - 20 + 4b.

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