# Circles (A_{51a}), (A_{51b}), (A_{51c}), (A_{51d}), (A_{51e}), (A_{51f}), (A_{51g}), and (A_{51h}): The insquare octet

### Definition

Consider the square OO_{1}M_{1}, where M_{1} is the highest point of (O_{1}). The insquare inscribed in
this triangle and in angle O has a sidelength equal to the Archimedean radius. This gives four Archimedean circles. Similarly four Archimedean
circles are found related to (O_{2}). [FvL, 3 mar 2008].

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