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20^=h^+10^
h^= 400-100
h^=300
h=10√3
Pc=Pp+3Pb
Pc=a^+4*1/2*a*h
Pc=20^+4*1/2*20*10√3
Pc=400+400√3
Pc=400*(1+√3)
l=a=20cm
Pp=a²
Pp = 20²
Pp = 400cm²
a√3
h= ------
2
20√3
h = ------- = 10√3
2
a*h
Ppb = 4*-------
2
Ppb = 2ah
Ppb = 2*20*10√3
Ppb = 400√3
Ppc = Pp + Ppb
Ppc = 400+400√3
Ppc = 400(1+√3) cm²