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ex 3 ex 4repede vă rog dau coroana ok dar daca e corect raspunsul ok​

Ex 3 Ex 4repede Vă Rog Dau Coroana Ok Dar Daca E Corect Raspunsul Ok class=

Răspuns :

3)
P_p=36cm
P_p=4•l
=>l=9cm
l_dreptunghi = l_patrat
l_d=9cm
L=4•l
L=4•9
L=36cm
P_d=2L•2l
P_d=2•9+2•36
P_d=18+72
P_d=90cm