Perimeter Formulas for Common Shapes
Reference table of perimeter formulas for common geometric shapes: square, rectangle, triangle, circle, parallelogram, rhombus, trapezoid, and regular polygon.
| Shape | Formula | Description |
|---|---|---|
| Square | P = 4a | All 4 sides are equal. P = 4 times the side length. |
| Rectangle | P = 2(a + b) | Opposite sides are equal. P = 2 times (length + width). |
| Triangle | P = a + b + c | Sum of all three sides. P = a + b + c. |
| Circle | C = 2πr | Circumference equals 2π times the radius. |
| Parallelogram | P = 2(a + b) | Opposite sides are equal. P = 2 times (a + b). |
| Rhombus | P = 4a | All 4 sides are equal. P = 4 times the side length. |
| Trapezoid | P = a + b + c + d | Sum of all four sides. P = a + b + c + d. |
| Regular polygon | P = n × a | All n sides are equal. P = n times the side length. |
How to Use the Perimeter Formulas for Common Shapes
- Enter the required dimensions (length, width, radius, height, etc.).
- The area, volume, or other geometric value is computed instantly.
- Review the result along with the formula used.
- Adjust dimensions to compare different scenarios.
Casos de Uso
- •Calculating dimensions for home improvement or DIY projects.
- •Solving geometry problems for school or professional exams.
- •Estimating material quantities needed for construction work.
- •Planning layouts and designs with precise measurements.
Fórmula
Perimeter is the total length of the boundary of a shape. Each shape has its own formula based on its sides or radius.
Perguntas Frequentes
What is perimeter?
Perimeter is the total distance around the outside of a two-dimensional shape.
How do you find the perimeter of a rectangle?
Add the length and width and multiply by 2: P = 2(a + b).
What is the perimeter of a circle called?
The perimeter of a circle is called the circumference: C = 2πr.
How do you find the perimeter of a regular polygon?
Multiply the number of sides by the side length: P = n × a.