Cineva ????
Matematica
![Cineva Matematica class=](https://ro-static.z-dn.net/files/d2f/9af2abc3603e3ff6120760b54a35b931.jpg)
Răspuns:
Explicație pas cu pas:
∡AOB+∡BOC=90°
∡AOB=5∡BOC ⇒6∡BOC=90° ⇒∡BOC=90°/6=15°
∡AOB=5·15°=75°