You see a wheel, a measurement of 8 cm, and a question asking for the perimeter of a rectangular box. Your brain immediately tries to connect the dots and jump to a fast answer.
But this is exactly where most people make a mistake.
The key to solving this correctly is not speed — it’s attention to detail.
That 8 cm marking is not just a random number. It represents a measurement related to the wheel, and many people assume it’s something else without thinking carefully. Some treat it like the full width, others ignore its position entirely.
Now here’s where it gets interesting…
If you analyze it properly, the 8 cm is part of a dimension that helps define the sides of the rectangle. When you interpret it correctly, you realize that the rectangle is based on this measurement in a way that forms its total boundary.
Remember:
👉 The perimeter of a rectangle is calculated as:
2 × (length + width)
So instead of guessing, you need to think:
- What are the actual sides of the rectangle?
- How does the 8 cm measurement relate to them?
- Are both sides equal or different?
Most people rush here and pick a smaller number… but that’s the trap.
When you carefully follow the logic and don’t skip steps, the correct total perimeter becomes clear.
✅ Correct Answer: D) 40 cm