Răspunsuri

  • Utilizator Brainly
2014-09-12T18:26:22+03:00
Ducem DM_|_AB si CN_|_AB=> d(DC , AB )= DM=CN=2√5 si DC=MN
in ΔDMA:
AM²=AD²-DM²=36-20=16
AM=4
InΔCNB avem
NB²=CB²-CN²=45-20=25
NB=5
Daca AD=DC=6
=>AB=AM+MN+NB=4+6+5
AB=15

in ΔACN
AC²=AN²+CN²=100+20=120
AC=2√30

in ΔDMB
DB²=DM²+MB²=20+121=141
DB=√141