Perimeter of square side 4.

**The reasoning** A square has **4 equal sides**. When you find the perimeter, you're measuring the total distance around the shape — like walking around the edges. Given: each side = 4 **Perimeter of a square = 4 × side length** So: Perimeter = 4 × 4 = **16** Think of it this way: You're adding all four sides together: 4 + 4 + 4 + 4 = 16 **Why the wrong options tempt you** - **A) 4** — This is just one side length. You forgot to go around the whole square! - **B) 8** — You only counted two sides (maybe opposite sides). A square has four sides, not two. - **C) 12** — You counted three sides. Close, but you missed one! **Quick takeaway** For **any square**, just multiply the side by 4: Perimeter = 4s. If one side is 4cm, walk around all four sides → 4 × 4 = 16cm. Simple!