📐 Geometry & Measurement
Perimeter Calculator
Calculate the perimeter of various 2D shapes using different formulas.
🔷 Shape Selection
Square: P = 4a
📐 Dimensions
Side (a)
cm
🔢 Unit Selection
Unit
Unit: cm
P
0
Perimeter
0 cm
total distance around
Shape
Square
Dimensions
—
Formula Used
P = 4a
Area
0 cm²
📊 Perimeter Details
| Parameter | Value | Unit |
|---|
How the formula works
Square: P = 4a | Rectangle: P = 2(l + w) | Triangle: P = a + b + c | Circle: P = 2πr
- Square = 4 × side
- Rectangle = 2 × (length + width)
- Triangle = side1 + side2 + side3
- Circle = 2 × π × radius (circumference)
- Trapezoid = a + b + c + d
- Parallelogram = 2 × (a + b)
- Rhombus = 4 × side
- Ellipse ≈ 2π × √((a² + b²)/2) (Ramanujan approximation)
- Pentagon = 5 × side
- Hexagon = 6 × side