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80 acres is 880 x 440 feet. Depends on how many cattle and how rough they are on your post settings. Most people around here in Oklahoma put their t-posts roughly 16' apart. This will take 164 posts. A roll of barbed wire will usually run a quarter of a mile of fence. So on a typical 5 wire fence it will take 30 rolls of barbed wire.
It depends on what kind of fence you wish to put up. For example, an electrified barbed wire and steel post fence would only require about three posts. But a wood plank and wood post fence would require about five or six.
21 posts.
32 posts
160post at 20 ft. apart
4
5 vertical posts are needed. I---I---I---I---I
You need 1962.5 fence posts.
56 posts are needed for the fence
9
Barbed wire for fences is typically found either above the fence to keep people from climbing over or in 3 rows to prevent going through the fence. The entire purpose of barbed wire is to either keep something in or someone out.
How many posts you need for a fence 54 x 54 depends on how far apart you wish to place the posts. Usually posts are placed every 6 - 8 feet, but stallion paddocks frequently have posts placed every 4 feet apart. It's not clear to me how many linear feet your fence is, because the question is written as if the fence is 54 feet high and 54 feet long.