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

Every cyclic parallelogram is a/an :

1. square

2. rhombus

3. rectangle

4. isosceles trapezium

An isosceles trapezium is always :

1. a parallelogram

2. a square

3. a rectangle

4. a cyclic quadrilateral