The perimeter $P$ of a rectangle is calculated using the formula:

$P = 2 \times ( \text{length} + \text{width} )$

Given:

• Length = 800 cm
• Width = 5 cm

Substituting the values:

$P = 2 \times (800 + 5) = 2 \times 805 = 1610 \, \text{cm}$

Thus, the perimeter is 1610 cm.

Would you like further details or have any questions?

Here are 5 related questions for practice:

1. What is the area of a rectangle with the same dimensions?
2. If the width was doubled, what would be the new perimeter?
3. How would the perimeter change if the length increased by 10%?
4. If the perimeter is 2000 cm, what could the dimensions be?
5. What is the diagonal length of the rectangle using the Pythagorean theorem?

Tip: The perimeter of any polygon is the total distance around its edges, and for regular polygons, you can use symmetry to simplify calculations.