What is the circumfrence of 1 acre?

It depends on the shape of the acre. A rectangular acre will have a different circumference than a square or round one.

One acre is 43,560 square feet. If it was in a square shape, each side would be 208.7 ft on each side, so the circumference would be 4 x 208.7 ft or 834.8 ft.

But what if the acre were round? Then it would be 739.7 ft in circumference.