Question

What is triangle ridigity

Answer 1

Rigidity
A triangle has three sides and three angles, and each angle is held solidly in place by the side opposite it. This means that a triangle's angles are fixed, and that if pressure is placed anywhere on a triangle, its angles, unlike those of other shapes, will not change.


http://www.ehow.com/facts_7512290_triangles-used-trusses.html

http://www.geom.uiuc.edu/~wanous/rigidityoftriangles.html