Draw five triangles first: △△△△△△△

Draw more than 5 circles: ○ ○ ○ ○.

Draw a square with fewer circles: □□□□□□□□□□□.

Draw 5 of the last number: ◎ ◎ ◎.

Note: Four lines of graphics should be vertically aligned.

Decision theorem

1: A diamond with equal diagonal lines is a square.

2. Diamonds with right angles are squares.

3: Rectangles with diagonal lines perpendicular to each other are squares.

4. A set of rectangles with equal adjacent sides is a square.

5. A set of parallelograms with equal adjacent sides and one angle at right angles is a square.