Respuesta :

dannielle
p=2*(L+l)=42
L+l=42:2
L+l=21
(L+l)^2=441
use the formula (a+b)^2=a^2+b^2+2ab
(L^2+l^2)+2l*L=441

D= V L^2+l^2= 15
L^2+l^2=225

 225+2l*L=441
     
2l*L=441-225=216
l*L=216:2
A=108 

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