yea, I'm eyeballing it at ~75' in diameter, so that checks out as 1/10 acre.
Ok cool, it just looked a lot smaller and I didn't want you to end up getting something you didn't like. A perfectly round pond with a 75' diameter does equate to 4418 square feet, which is almost exactly 1/10th of an acre, but a 50' diameter pond is less than 1/20th of an acre at 1963 sq ft. It does look pretty cool though, and would make a great panfish pond. Excited to see how it turns out.