Răspunsuri

Cel mai inteligent răspuns!
2014-09-08T12:14:34+03:00
A =b.h/2
b-baza,h-inaltimea
daca A(COB)=13 =A(ODA)
A(DOC)=A(AOB)
daca notam cu b=CB si h-inaltimea din ΔOCB
A(ABCD)=2.b.h/2+2.h.b/2=2.13+2.13=52 cm²
unde
A(DOC)=2hb/2.2=h.b/2=A(OAB)

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