Description & Comments



There are a circle, a square, and four equilateral triangles.
The center of the square is the center of the circle.
The square is contained in the circle and does not have points on the circumference.
The equilaterateral triangles are external to the square and have one side in common with it.
One vertex of each triangle is on the circumference.

COMMENT: We suppose that the radius of the circle is \(1\) because it is easy to rescale lengths and areas.