Pai... Daca B=45 grade =} C=45 grade =}B=C=45grade =}ABC isoscel in A =}AB=AC=10 cm
ABC dreptunghic =}ABxAB(AB la puterea a doua) +ACxAC(AC la puterea a doua)=BCxBC(BC la puterea a doua) =}10x10+10x10=BCxBC
=}100+100=BCxBC =}200=BC la puterea a doua =}BC=√200 =}BC=10√2cm
