Write it on paper dont do a similar question on chegg Pls resolve question its important $..............!!!!!!!!!!$

partial view of two different column supported slabs is given below. Calculate the critical shear perimeter for each cases. Slab thickness $h_f=18cm.$ Effective depth $d=16cm.$ All dimensions given in the plan are cm $.($Drawings are not scaled!$)$

a$)(20$ points$)$

b$)(15$ points$)$