Question

perimeter = 18
3+3
length of missing side l =
(rectangle with width 3 and length l)

Explanation:

Step1: Recall perimeter formula for rectangle

The perimeter \( P \) of a rectangle is given by \( P = 2\times(\text{length} + \text{width}) \). Here, the width is 3, and the perimeter is 18. Let the length be \( L \). So, \( 18 = 2\times(L + 3) \).

Step2: Simplify the equation

First, divide both sides by 2: \( \frac{18}{2}=L + 3 \), which simplifies to \( 9 = L + 3 \).

Step3: Solve for \( L \)

Subtract 3 from both sides: \( L=9 - 3 \).

Answer:

6