A---------------------------12cmpana la punctul B--------------------------C-------M-------------------------------------B--------------O-----------------------7cm----------------------M
12-7=5 cm intre OsiB
-------------------------------50cm intre B si D----------------------------50/2=25 cm---
A-------------------------------B------------------------------C-------------------------------D
sa recapitulam sunt 50 cm intre Bsi D,si sunt 25 cm intre A si B.Mai departe cred ca te descurci. SUCCESE