# Geometry of deformation of Axial members connected to a rotating rigid element

On axial members connected to a rotating rigid element,

we have the following relationship $$\frac{-\delta_1}{a}=\frac{\delta_2}{b},$$

which is based on the concept of similar triangles.
In the relationship, what is $$a$$ and $$b$$?

$$a$$ and $$b$$ refers to the lengths of the rotating rigid member corresponding to the deformed member that is being attached.