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ਕਦਮ ਦਰ ਕਦਮ

1. \text{interior angle} = \frac{(n-2)\cdot 180^\circ}{n} = 135^\circ

   A regular 8-gon.

2. P = n s = 8

   Perimeter.

3. a = \frac{s}{2\tan(\pi/n)} = \frac{1}{2} + \frac{\sqrt{2}}{2} \approx 1.2071

   Apothem (centre to the middle of a side).

4. A = \tfrac{1}{2} P a = 2 + 2 \sqrt{2} \approx 4.8284

   Area = half the perimeter times the apothem.