November 5 – 309.

Geogebra. – Sangaku in a square – is the title of this 300 year old sangaku: a triangle is formed by a line that joins the base of a square with the midpoint of the opposite side and a diagonal. Find the radius of the inscribed circle. In this three- dimensional environment, once I found the circle’s radius, it was tempting to free the sphere from the square and explore the space around the pyramid-like vertices…


3 thoughts on “309

  1. Thanks for your support (b)
    A straightjacket kind of software – all math – no fun 😦 But using (2D) flat geometry sangaku problems and moving them into the 3D option of the program makes it fun somewhere…

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