If one side of a square is 12 cm, find its area.

Correct answer: 144. Area of a square = side² = 12 × 12 = 144 cm².

Background: All sides of a square are equal.

• 145: 145 is not 12 × 12.
• 156: 156 is not 12 × 12.
• 146: 146 is not 12 × 12.

Did you know? The perimeter would be 4 × 12 = 48 cm.

Memory trick: Square → side × side.