An explanation is required or else not brainliest.

16 meters

Step-by-step explanation:

is tangent to the circle at point R and FR is radius.

(Tangent radius theorem)

So, is right angled triangle and FS is its hypotenuse.

Let FR = FT = r

FS = FT + ST = r + 9

Now, by Pythagoras theorem:

Thus, the diameter of the fountain is 16 meters.

d

because parallelagram have all 4 angels the same size dependeing and a rectangle and square are oth parallelogram