▸This regular heptagon has an area of 363.39 cm² and a perimeter of 70 cm.
- Area scales with the square of the side: A ≈ 3.6339·a², so doubling the side quadruples the area.
- Each interior angle is exactly 900°/7 ≈ 128.571°, and all seven sum to 900°. The exterior angle is 360°/7 ≈ 51.429°.
- A heptagon has 14 diagonals: 7 short ones (18.02 cm) and 7 long ones (22.47 cm).
- The circumscribed circle has radius 11.52 cm and passes through all seven vertices.
Next stepTo draw this heptagon with a compass, set the radius to 11.52 cm and step vertices around the circle at 51.429° intervals.