Physics
posted by joe .
Two metal beams are joined together by four rivets, as the drawing indicates. Each rivet has a radius of 5.0 103 m and is to be exposed to a shearing stress of no more than 4.6 108 Pa. What is the maximum tension T that can be applied to each beam, assuming that each rivet carries onefourth of the total load?

4* (single rivet area)*(maximum shear stress)
= maximum tension 
how do you get the single rivet area?