I would say that every month she puts 90$ and at first she had 197$
Answer:
Step-by-step explanation:
area πr²=28.26
r²=28.26/π
r=√(28.26/π)≈ 9cm

is the second or third Pythagorean triple on the list, which gives us the answer directly.
But if we didn't know that, let x be the short leg:




Rejecting the negative root, x=5, other side 12, the Pythagorean triple we found.