Răspunsuri

2014-07-31T15:51:44+03:00
Aplicam teorema lui Thales

In orice triunghi, o paralela la o latura, imparte celelalte doua laturi in segmente proportionale. 

 \frac{AD}{BD} =  \frac{AE}{EC} => \frac{2}{5} = \frac{AE}{10}=>AE*5=2*10=>AE= \frac{2*10}{5}=4 cm
 
AB=AD+DB=2+5=7cm