Question

a rectangle has a length of 18 cm and a width of 4 cm. what is its perimeter?

Explanation:

Step1: Recall the formula for the perimeter of a rectangle

The formula for the perimeter \(P\) of a rectangle is \(P = 2\times(\text{length}+\text{width})\). Let \(l = 18\) cm (length) and \(w = 4\) cm (width).

Step2: Substitute the values into the formula

Substitute \(l = 18\) and \(w = 4\) into \(P = 2\times(l + w)\). So \(P=2\times(18 + 4)\).
First, calculate the sum inside the parentheses: \(18+4=22\). Then, multiply by 2: \(2\times22 = 44\).

Answer:

\(44\) cm