Question

1) Fie ABCD trapez, AB || CD ,AB=2cm, AC ∩ BD={O} ,AO=3 cm si OC=6cm. Aflati CD .
2)Fie ΔABC, M si N sunt mijloacele laturilor ((AB)) respectiv ((AC)), MN=6cm. Afati BC.

PS : ((AB)) si ((AC)) ⇒AB intre paranteze patrate si AC intre paranteze patrate.
VA ROGG , URGEEENTT !! DAU COROANA !!!

Answer 1

1.
Δ AOB asemenea cu ΔDOC
AO/OC=AB/DC
3/6=2/CD
CD=2×6/3=4 cm


2. MN linie mijlocie in triunghi  ⇒ MN=BC/2   ⇒ BC=2×MN=2×6=12 cm