Question

the perimeter of a rectangle is 38 cm and its length is 12 cm find its breadth

Answer 1

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Perimeter of rectangle = 38cm
Length = 12cm

$38cm = 2l + 2b \\ 38 =24 + 2b \\ 2b = 38 - 24 \\ 2b = 14cm \\ breadth = 7cm$
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Answer 2

Perimeter=2×(l+b)

Perimeter=2×(12+b)

Breadth=38-24=14