AD mediana => BD=DC=AC =>
BD=6 cm
DC=6 cm
BC=BD+DC<=>
<=>BC=6+6<=>
<=>BC=12 cm
TriunghiABCdreptunghic, m(A)=90grade => catpatrat=pr•ip<=>
<=>ABpätrat=BC•BD<=>
<=>ABpätrat=12•6|radical<=>
<=>radicalABpatrat=radical72<=>
<=>AB=radical72<=>
<=>AB=2radical6
Raspuns:
AB=2radical6
BC=12 cm