Question about stress and strain

[hoyy1kolko]

Homework Statement

The elastic limit for a type of material is 1.6 x 10^8 Pa.Determine the minimum diameter if a wire which is made of this material so that it can support a load of 100N without the stress exceeding the elastic limit.

Homework Equations

elastic limit=stress
=F/A
1.6 x 10^8=100/ (pie)d^2
I can't get the answer.please help

The Attempt at a Solution

 

[Delphi51]

In your S = F/A formula, replace A with the area of the circular wire.
Solve for the radius or diameter.
Put in the numbers for S and F.