Perimeter Calculator
Calculate the perimeter and circumference of various geometric shapes including rectangles, circles, triangles, squares, polygons, and more. Get step-by-step solutions with formulas and explanations.
Rectangle Perimeter Calculator
Formula: Perimeter = 2 × (length + width)
Circle Circumference Calculator
Formula: Circumference = 2 × π × radius
Triangle Perimeter Calculator
Formula: Perimeter = side₁ + side₂ + side₃
Square Perimeter Calculator
Formula: Perimeter = 4 × side
Regular Polygon Perimeter Calculator
Formula: Perimeter = number of sides × side length
Ellipse Perimeter Calculator
Formula: Perimeter ≈ π × [3(a + b) - √((3a + b)(a + 3b))]
Perimeter Formulas for Common Shapes
Basic Shapes
- Rectangle: Perimeter = 2 × (length + width)
- Square: Perimeter = 4 × side
- Circle: Circumference = 2 × π × radius
- Triangle: Perimeter = side₁ + side₂ + side₃
Advanced Shapes
- Regular Polygon: Perimeter = n × side length
- Ellipse: Perimeter ≈ π × [3(a + b) - √((3a + b)(a + 3b))]
- Parallelogram: Perimeter = 2 × (side₁ + side₂)
- Rhombus: Perimeter = 4 × side
Related Calculators
- Area Calculator - Calculate area of 2D shapes
- Volume Calculator - Calculate volume of 3D shapes
- Math Calculators - More mathematical tools