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Răspuns :

aplicam Thales tinand cont ca rombul este si paralelogram , deci MN|| AC
(vezi pagina a doua, unde am reluat)
 rezulta AC=4
atunci AC/2=2=AD
fie BD⊥AC, D∈AC, 
aplicand te Pitagora in ABD, rezulta BD=√(AB²-AD²)=√(144-4)=√140=2√35
Vezi imaginea ALBATRAN
Vezi imaginea ALBATRAN