New blog post: Circles crossing at equal angles, https://11011110.github.io/blog/2018/12/22/circles-crossing-equal.html, proving that if a non-self-crossing quadrilateral with circular-arc sides has four equal interior angles at its vertices, then it is cyclic.
A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes.
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