Calculation of Tensions
This activity belongs to the GeoGebra book GeoGebra Principia.
If we start with an arbitrary quadrilateral, tensegrity is only achieved for certain positions and tensions. If we vary any of those positions or tensions, the structure will automatically seek the new equilibrium position.
The key is in the vertices: the vector sum of the forces involved must always be zero.
Author of the construction of GeoGebra: Rafael Losada.