The largest chord of a circle is 20 cm, then its radius is :

1. 20 cm

2. 40 cm

3. 10 cm

4. none of these

The relation between the area enclosed by a major segment of a circle and area enclosed by its semi-circle is :

1. major segment is smaller than the semi-circle.

2. major segment is bigger than the semi-circle.

3. major segment is equal to the semi-circle.

The diameter of a circle with centre at point O is 30 cm. A point P lies in the same plane as the circle and OP = 20 cm, then point P lies :

1. on the circumference of the circle

2. inside the circle.

3. outside the circle.

4. nothing can be said

The angle between a line AB and the diameter of a circle is 90°; line AB is :

1. a tangent of the circle

2. not a tangent of the circle

3. nothing can be said