Perimeter of rectangle 6×4.

**The reasoning** A rectangle has **two lengths** and **two widths**. The perimeter is the total distance around the shape. Formula: **Perimeter = 2(length + width)** Given: length = 6, width = 4 Perimeter = 2(6 + 4) = 2(10) = **20** Alternatively, add all four sides: 6 + 6 + 4 + 4 = 20 --- **Why the wrong options tempt you** **A) 10** — You only added length + width once (6 + 4), forgetting a rectangle has *four* sides, not two. **C) 24** — You multiplied 6 × 4, which gives the **area** (space inside), not the perimeter (distance around). **D) 30** — You might have added 6 + 6 + 6 + 6 + 6, treating all sides as 6, or made a calculation error. --- **Quick takeaway** **Perimeter = add all sides; Area = multiply length × width.** For rectangles, always remember you're going around *four* sides: two long, two short. Double-check which the question asks for!