Question

find the perimeter of the rectangle. include the unit. 21 cm 28 cm

Explanation:

Step1: Recall perimeter formula

The perimeter formula for a rectangle is $P = 2(l + w)$, where $l$ is the length and $w$ is the width.

Step2: Identify length and width

Here, $l = 28$ cm and $w = 21$ cm.

Step3: Substitute values into formula

$P=2(28 + 21)$.
First, calculate the sum inside the parentheses: $28+21 = 49$ cm.
Then, multiply by 2: $P = 2\times49=98$ cm.

Answer:

98 cm