The angle in a semi-circle is :

1. an acute angle

2. an obtuse angle

3. a right angle

4. can be either acute or obtuse

The angle subtended by an arc of a circle at any point on the remaining part of the circle is of the angle subtended by it at the centre.

1. double

2. half

3. equal

4. triple

If a pair of opposite angles of a quadrilateral are supplementary, then the quadrilateral is :

1. a rectangle

2. a parallelogram

3. a square

4. a cyclic quadrilateral

The exterior angle of a cyclic quadrilateral is equal to :

1. 90°

2. the interior opposite angle

3. the interior adjacent angle

4. any of the interior angles