Answer:
5.48 inches
Explanation:
Given that the poster is in the shape of a square.
Area of the square poster = 30

To find:
The length of side of the poster = ?
Solution:
First of all, let us have a look at the formula for area of a square.
Let the side of square =
inches
Formula:

Putting the value of the side:

Putting the value of Area as given in the question statement:
