Question

determinati lungimea diagonalelor unui dreptunghi, cu aria de 48 cm patrati si perimetrulegal cu 28cm

Answer 1

A=l×L=48 P=2 (l+L)=28=>P=14 L+l=14=>L=14-l L×l=48=>(14-l)×l=48=>14l-l^2-48=0=>l^2-14l+48=0=>delta=4=>l=(14+2)/2=8 =>sau (14-2)/2=6 deci L =6 sau 8