Dau corona imi trebuie mainee!

∆-triunghiul, <unghiul
[.. ]-segment
[-dreapta
=- congruent
a) ∆ACD=∆ACB
b) ∆AOD=∆COB
<D=<C
c)∆ACB=∆ACD
[AB=[AD
[BC=[DC
d)∆ADE=∆BCF
[AD=[BC
[ED=[BF