Advanced Perimeter Calculator
Rectangle
Square
Circle (Circumference)
Triangle (Scalene/General)
Regular Polygon
Total Perimeter:
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Understanding Perimeter Calculation
Perimeter is the total distance around the outside of a two-dimensional shape. Whether you are calculating the amount of fencing needed for a backyard, the trim required for a window, or the distance around a running track, understanding perimeter is a fundamental skill in geometry and real-world construction.
Common Perimeter Formulas
Depending on the geometry of the object, different mathematical formulas are applied:
Rectangle: P = 2 × (Length + Width)
Square: P = 4 × Side
Circle: C = 2 × π × Radius
Triangle: P = a + b + c
Regular Polygon: P = n × Side Length
Square: P = 4 × Side
Circle: C = 2 × π × Radius
Triangle: P = a + b + c
Regular Polygon: P = n × Side Length
Practical Examples
Example 1: The Backyard Fence
Suppose you have a rectangular garden that is 20 meters long and 15 meters wide. To find the amount of fencing required:
Calculation: 2 × (20 + 15) = 2 × 35 = 70 meters.
Example 2: The Circular Table
If you need to put decorative tape around the edge of a circular table with a radius of 3 feet:
Calculation: 2 × 3.14159 × 3 ≈ 18.85 feet.
Why Precision Matters
In construction and manufacturing, perimeter calculations must be precise to avoid material waste. Our calculator provides high-precision results for irregular triangles and regular polygons alike, ensuring your projects are measured accurately every time.