For a regular hexagon, inscribing a circle, the length of the side of the hexagon and the radius of the circle are :

1. equal

2. not equal

3. side of hexagon is bigger than the radius of the circle

4. side of hexagon is smaller than the radius of the circle.

A regular octagon is circumscribing a circle, the angle subtended by each side of the regular octagon at the center of the circle is :

1. 60°

2. 30°

3. 45°

4. (2 × 8 - 4) × 90°

O is center of the the circle and ∠AOB = 60°. The length of chord AB is :

1. equal to radius of the circle

2. equal to the side of a regular pentagon

3. bigger than the radius of the circle

4. smaller than the radius of the circle.

Incenter of a triangle is the point of intersection of the :

1. perpendicular bisector of its sides

2. bisectors of its angles

3. one perpendicular of its side and bisector of any one angle of it

4. none of these.