Answer:

Step-by-step explanation:
We can start by finding the third side of the triangle/the side of the square using the Pythagorean Theorem:

In this case the side length of the square would be represented by the variable "c" as it is the hypotenuse:




Since the area of a square is the side length square then...

The square root and the squared cancel out giving us...

Answer:
18 units
Step-by-step explanation:
The answer is D
Steps
Take the root of both sides and solve
It would be 9 ft. using the knowledge of

times the diameter (

equals aprox. 3.14) equal the circumference of a circle, and since we know the circumference, we need to divide that by

to get the diameter.
equation: 28/3.14=8.913
rounding that would bring it to 9 ft.