Area of square side 6.

**The reasoning** The formula for the area of a square is: **Area = side × side = side²** Since each side is 6 units: Area = 6 × 6 = **36 square units** This works because a square has all four sides equal, and area measures how many unit squares fit inside. When you multiply length by width (which are the same in a square), you get the total space covered. **Why the wrong options tempt you** - **Option A (12):** You might add instead of multiply: 6 + 6 = 12. But area needs multiplication, not addition! - **Option B (24):** This is the *perimeter* (adding all four sides: 6 + 6 + 6 + 6 = 24). Easy mix-up if you're rushing. - **Option D (48):** Maybe you multiplied 6 × 8 or doubled the perimeter by mistake. **Quick takeaway** For area of a square, always **square the side** (side × side), never add. Perimeter adds, area multiplies!