Răspuns :
intr-un triughi produs intre o latura si inaltimea corespunzatoare este constant
deci AB*CF=AC*BE
20*18=30*BE
2*18=3Be
2*6=BE
BE=12cm
as simple as that!
deci AB*CF=AC*BE
20*18=30*BE
2*18=3Be
2*6=BE
BE=12cm
as simple as that!