Question

Anna wants to put a fence around a rectangular garden plot that measures 9 feet by

Answer 1

Hello!

The answer is:

Anna will need 27 posts.

Why?

To calculate how many post does she need to place at the corners and every 2 feet around, we need to calculate the perimeter of the garden plot.

So, we can calculate the perimeter of the garden plot (rectangle) using the following formula:

$Perimeter=2height+2width$

We know that:

$height=9ft\\width=18ft$

Then, calculating the perimeter of the garden plot, we have:

$Perimeter=2height+2width$

$Perimeter=2*9ft+2*18ft=18ft+36ft=54ft$

Now, calculating how many post she will need, we have:

$No.Post=\frac{Perimeter}{DistanceBetweenPost}\\\\\frac{54feet}{2feet}=27posts$

Hence, we have that Anna will need 27 posts.