You can form an equation for the number, x. What is meant by "of a number"?
You will have to provide us with options for us to fully be able to help you.
Answer:
12.5 in^2
Step-by-step explanation:

25=2(3.14)r
25=6.28r
Divide by 6.28 on both sides:
3.98089172=r
Now use
:
12.5 in^2
They are same side interior!! Not alternate, they’d be on opposite sides of the line