Steiner deltoid is hypocycloid
Steiner deltoid es an hypocycloid which is generated by a circle rolling inside another circle. que está generada por una circunferencia que rueda por el interior de otra.
Both circles are related with the Feuerbach circle (the nine points circle).
The exterior circle has the same center as the Feuerbach circle and its radii is three times bigger.
The other circle has the same radii as the Feuerbach circle and both are tangent.
The animation show us how the deltoid is generated.
We can change the vertices of the triangle and the point that determines the Wallace-Simson line.
The three tangents to the deltoid at the three cuspides pass through the certer of the Feuerbach circle.
