How to calculate changes in the radius of a surface under compression?

[Cianturyo]

How do i calculate percentage of changes in radius, when the surface which cause the radius, will be compressed by a certain percentage?

To illustrate better, i have drawn the picture of the question. How to calculate radius ?? if radius A Is known. Changes in the surface is also known. Thank you very much beforehand.
Ciantury

 

[berkeman]

How do i calculate percentage of changes in radius, when the surface which cause the radius, will be compressed by a certain percentage?

To illustrate better, i have drawn the picture of the question. How to calculate radius ?? if radius A Is known. Changes in the surface is also known. Thank you very much beforehand.
Ciantury

Welcome to the PF.

Is that a solid metal cylinder? What is causing the change in the radius of the cylinder?

 

[JBA]

Do you mean "pressure" which would imply uniform load all around the circumference of the cylinder; or, a load applied along two opposite sides of a cylinder?