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21. Solve the following

A

B

C

D

A (90 degrees CW rotation)

22. Which of following collections form a square?

Hint: Some of the shapes should be rotated.

A

B

C

D

B.

23. Which matchstick needs to be moved in order to create a square?

- Left
- Top
- Right
- Bottom
- Not possible.

All matchsticks are of the same length, including the left one.

Originally all matchstick ends were at right angles to each other, apart from the left one.

The left matchstick must be moved to the left, to create a perfect square.

24. Remove 6 matchsticks to create two squares of unequal size.

Remove two matches from any corner to create the first, small square.

25. Remove 3 matches to leave 3 squares.

Two of the matches are adjacent to each other.