Question

OA=OB(both are radii of same circle)
∠OAB=∠OBA=x(say)
In ΔAOB,
∠OBA+∠OAB+∠AOB=180°
x+x+60°=180°
2x+60°=180°⇒2x=180°-60°=120°⇒x=120/2=60°
∠OAB=∠OBA=∠AOB=60°
∴ΔAOB is equilateral
AB=OA=5cm
∴AB=5cm

Answer 1

yes then ...

good job

Answer 2

Yes!!!

You are doing well mate!!!

It is correct!!..

Thanks!! ✌️✌️