Which of these is an example of a closed figure?

1. Open curve

2. A line

3. Rectangle

4. Ray

Which of these angles is greater than a right angle but less than a straight angle?

1. Acute angle

2. Obtuse angle

3. Reflex angle

4. Right angle

The area of a rectangle of length 12 cm and breadth 5 cm is

1. 17 cm²

2. 34 cm²

3. 60 cm²

4. 30 cm²

The average (mean) of the numbers 6, 8, 10, 12 is

1. 8

2. 9

3. 10

4. 11