Va rog frumos ex. 1,2 si 3 !!!!!!

1.
a) alungit
b) nul
2. ∡AOB, ∡BOC, ∡COD, ∡DOE, ∡AOC, ∡BOD, ∡COE, ∡AOD, ∡BOE
3.
∡ADB, ∡ABD
∡BDC, ∡DBC
∡BAD, ∡BCD