(80+2)*(80+2)=6400+2*2*80+4=6724
(100+1)*(100+1)=10000+2*100*1+1=10201
(30+1)*(30+1)=900+2*30*1+1=961
(20+3)*(20+3)=400+2*20*3+9=529
(80+2)*(80+2)=6400+2*2*80+4=6724
(100+1)*(100+1)=10000+2*100*1+1=10201
(30+1)*(30+1)=900+2*30*1+1=961
(20+3)*(20+3)=400+2*20*3+9=529