Question

plz answer quickly.......​

Answer 1

Answer:

a) 60°

Step-by-step explanation:

We know that angle at the circumference of a circle is half the angle at the centre subtended by the same arc

Angle O=120°

therefore, angle ACB=60 °

Answer 2

Answer:

this answer is - b) 120°

Step-by-step explanation:

1. angle abo = 30°
2. angle bao = 30°
3. 3(angle) = 180°
4. = 180° - (30° +30°)
5. = 180°-60°
6. = 120°
7. angle abo = 120°
8. angle acb = 120°