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You need to use your maths - work out your circle circumference by equation; circumf = 2x radius x pie (couldn't find the symbol 3.144444 etc) so 4m circumference would be 12.56m then divide that by your brick length will give you the amount you need.
I've done the circle edging several times, don't need to use mot or wacker it but cement in the bricks and make sure they are haunched in firmly where the pressure will be greatest (i.e on the other side of the grass).
Make sure you set your heights first so that your grass will sit slightly proud of the bricks so the mower won't hit.