Option (4) is the right one.
The length of a side of the sandbox is
inches.
Step-by-step explanation:
We know that Joan is constructing a sandbox shaped like a regular pentagon, which has a perimeter of
inches.
Our goal is to determine the length of one side of the sandbox.
Given that the sandbox forms a regular pentagon, we can say that the perimeter equals 5 times the side length.
Thus, Perimeter of pentagon = 5 × sides
The stated Perimeter is
inches.
Therefore,
= 5 × sides
By dividing both sides by 5, we get,
= sides
Consequently, the length of one side of the sandbox is
inches.