[tex]a = 60cm = 0,6m\\b = 0,4m\\c = 2,5dm=25cm=0,25m[/tex]
[tex]Pc=2ab+2ac+2bc\\Pc=2*0,6m*0,4m+2*0,6m*0,25m+2*0,4m*0,25m\\Pc=2*0,24m^2+2*0,15m^2+2*0,1m^2\\Pc=0,48m^2+0,3m^2+0,2m^2\\Pc=0,98m^2[/tex]
[tex]1m=10dm\\1m^2=100dm^2[/tex]
[tex]0,98m^2=98dm^2[/tex]
