Perimeter of 2D Shapes Practice Problems & Formula Solutions
The perimeter is the total continuous boundary distance around a closed geometric shape. Practice finding perimeter for rectangles, squares, triangles, regular polygons, and solving algebraic missing side problems.
🧠 Core Problem-Solving Strategies
📏 Rectangle Perimeter: P = 2(L + W)
Add the adjacent dimensions and double the result: 2 × (8 + 5) = 2 × 13 = 26 cm.
📐 Regular Polygon Perimeter: P = n × s
For shapes with equal sides (equilateral triangles, squares, regular hexagons), multiply the number of sides (n) by the side length (s).
🔍 Missing Side Recovery
For a rectangle with known perimeter P and length L: Width W = (P − 2L) / 2.
❓ Frequently Asked Questions
What is the formula for the perimeter of a rectangle?
The formula is P = 2(L + W) or P = 2L + 2W, where L is length and W is width.
What is the difference between perimeter and area?
Perimeter measures 1D linear outer boundary distance (units: cm, ft), while area measures 2D interior surface coverage (units: cm², ft²).
Continue Learning & Practicing
Reinforce your understanding with printable worksheets, step-by-step guides, calculators, and speed games: