In the given figure, if O is the centre of the circle, then the value of x is :

1. 40°

2. 50°

3. 70°

4. 30°

In the given figure, O is centre of the circle.
If ∠AOC = 130°, then the value of x is :

1. 25°

2. 50°

3. 65°

4. 40°

ABCD is a cyclic quadrilateral. If ∠BAD = (2x + 5)° and ∠BCD = (x + 10)°, then x is equal to :

1. 65°

2. 45°

3. 55°

4. 5°

Assertion (A): In the given figure, if O is the centre of the circle, then ∠ACB = 40°.

Reason (R): Angle at the centre is double the angle at the remaining part of the circle.

1. A is true, R is false

2. A is false, R is true

3. Both A and R are true

4. Both A and R are false