perimeter = 2 x (length + width)
⇒ length + width = perimeter ÷ 2
⇒ length = (perimeter ÷ 2) - width
So to find the length of the given rectangle, subtract the width from half the perimeter is how to do it.
IF you meant "What is the length..." then:
length = perimeter ÷ 2 - width
= 40 ÷ 2 - 2 in
= 20 - 2 in
= 18 in
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If the shape is a rectangle, then Perimeter = 2(Length + Width) So Width = Perimeter/2 - Length
you need length and width length multiply width = area length + length + width + width = perimeter
Length + length + width + width = perimeter. Length + width x 2 = perimeter
Perimeter = 2 * width + 2 * length, so rearranging --> width = (Perimeter / 2) - length
10x2