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.