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Thanks @mmccarthy and @wence. I think I will play around with some basic graphics code. My maths isn't great though (e.g. I found Bresenham's circle drawing algorithm, but couldn't really read it) so needs to be fairly simple algorithms.
Ah cool! I thought it was an exam question or something with the result being in terms of pi.
Looks like you found your answer though! Also, not sure if it'll be useful for this case, but have you seen this sort of thing?
https://donatstudios.com/PixelCircleGenerator