In context of the given figure, which of the following statement is correct?

1. B is not a point on segment $\overline{AC}$

2. B is the initial point of the ray $\overrightarrow{AD}$

3. D is a point on the ray $\overrightarrow{CA}$

4. C is a point on the ray $\overrightarrow{BD}$

The figure formed by two rays with same initial point is known as

1. a line

2. a line segment

3. a ray

4. an angle

Which of the following statements is false?

1. A triangle has three sides

2. A triangle has three vertices

3. A triangle has three angles

4. A triangle has two diagonals

By joining any two points of a circle, we obtain its

1. radius

2. chord

3. diameter

4. circumference