Direction In each of the following questions, group the given figures into three classes using each figure only once. -
1.

 A. 1,4 ; 2,3 ; 5,6 B. 1,5 ; 2,6 ; 4,3 C. 1,6 ; 2,3 ; 4,5 D. 1,2 ; 3,6 ; 4,5
Explanation:

(1, 4), (2, 3) and (5, 6) are three different pairs of identical figures.

2.

 A. 1,3,9 ; 2,5,6 ; 4,7,8 B. 1,3,9 ; 2,7,8 ; 4,5,6 C. 1,2,4 ; 3,5,7 ; 6,8,9 D. 1,3,6 ; 2,4,8 ; 5,7,9
Explanation:

1, 3, 9 have one element placed inside a different element.

2, 5, 6 contain two mutually perpendicular lines dividing the figure into four parts.

4, 7, 8 have two similar elements (unequal in size) attached to each other.

3.

 A. 7,8,9 ; 2,4,3 ; 1,5,6 B. 1,3,2 ; 4,5,7 ; 6,8,9 C. 1,6,8 ; 3,4,7 ; 2,5,9 D. 1,6,9 ; 3,4,7 ; 2,5,8
Explanation:

1, 6, 9, are all triangles.

3, 4, 7 are all four-sided figures.

2, 5, 8 are all five-sided figures.

4.

 A. 1,2,3 ; 4,5,6 ; 7,8,9 B. 1,3,5 ; 2,4,6 ; 7,8,9 C. 1,5,9 ; 3,6,2 ; 4,7,8 D. 1,9,7 ; 2,8,5 ; 3,4,6
Explanation:

1, 2, 3 are figures composed of two straight lines.

4, 5, 6 are figures composed of three straight lines.

7, 8, 9 are figures composed of four straight lines.

5.

 A. 1,4,7 ; 2,5,8 ; 3,6,9 B. 1,4,7 ; 2,5,9 ; 3,6,7 C. 1,3,4 ; 2,5,8 ; 6,7,9 D. 1,2,3 ; 4,5,6 ; 7,8,9
Explanation:

1, 4, 7 are all (two-dimensional) quadrilaterals.

2, 5, 8 are all three-dimensional figures.

3, 6, 9 are all (two-dimensional) triangles.