Pentagon Calculator
Calculate the area, perimeter, apothem, and diagonal of a regular pentagon from its side length.
How to Use Pentagon Calculator
The Pentagon Calculator computes all key measurements of a regular pentagon from its side length. Enter the side length and instantly get the perimeter (5 × side), apothem (distance from center to midpoint of a side), area (using the formula Perimeter × Apothem / 2), and diagonal length (side × golden ratio). A regular pentagon has five equal sides and five equal interior angles of 108°. Essential for geometry students, architects, designers working with pentagonal shapes, and anyone needing precise pentagon measurements.
Step-by-Step Instructions
- Enter the side length of the regular pentagon
- Click Calculate to compute all measurements
- View perimeter, area, apothem, and diagonal values
- Copy results with the formula shown
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