In last week's video, I wrote a program to calculate pi by drawing the outline of a circle and estimating the circumference by counting pixels. This is not the right method, and I explained that in the video.
I said it was because the outline is "sampling" the circle - but that' not right. I'll refer you to a very well done video from 3 blue 1 brown about why this doesn't work. It's the second of the "false proofs" he demonstrates:
https://www.youtube.com/watch?v=VYQVlVoWoPY
A better way to calculate pi by counting pixels is with the Area. And that's our updated video for this week.
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