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determinati aria coperti de fizica cl a 6

Răspuns :

l=17cm
L=23 cm
A=Lxl 
17x23 = 391 cm 
Cartea are:
lungimea(l)=23.5cm
latimea(L)=16.5cm
Coperta are:
latimea(L)=23.5cm
lungimea(l)=16.5+16.5+1=34cm
Coperta este un dreptunghi
A=2l+2L
A=23.5*2+34*2=68+47=115cm²