Group the following figures into three classes on the basis of identical properties.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 1, 3, 8; 2, 6, 9; 4, 5, 7
The nine figures fall into three groups by the kind of figure:
1, 3, 8 — solid containers drawn with an oval top (a barrel, a drum and a bucket), that is, three-dimensional figures
2, 6, 9 — plain four-sided figures with nothing inside (a tilted rectangle, a rectangle and a parallelogram)
4, 5, 7 — flat figures cut into four parts by one upright and one level line (a diamond, a triangle and a circle)