Answer:
162 cm
Explanation:
Alright so the formula for perimeter is 2L + 2W = P
The length is 18, and the perimeter is 54, so the equation becomes 2(18) + 2W = 54.
This simplifies to 36 + 2W = 54.
So begin isolating the W, you subtract 36 from both sides:
2W = 18
Then you get W by itself by dividing both sides by 2:
W = 9
Now that you know your width is 9, you multiply it by the length, 18, to get the area.
9 x 18 = 162
