First, have a play with an octagon:

Octagon figure. The perimeter of a geometric figure is the total length around its outline. The formula to calculate the perimeter of a regular octagon is 8 side. The octagon | 888 main street | new york, ny 10044 | 888 main street | new york, ny 10044

A regular octagon is a geometric shape with 8 equal lengths and 8 equal angles. A total of 20 diagonals. An octagon, like any other polygon, can be either convex or concave, as illustrated in the next figure.

Select the radio button for one of the dimensions, enter its value, and click the calculate button to obtain the other. The sum of the interior angles of a regular octagon is 1080 degrees, which makes each angle equal to 135. Area of an octagon formula.

Parts of an octagon diagonals of an octagon. This length can be calculated by adding the lengths of all the sides of the figure. An octagon is one of the plane figures or a polygon having eight sides.

Therefore, we have, 8 side = 200. The perimeter of the regular octagon is 200 cm (given). The formula for the area of an octagon of regular shape is 2 · (1 + √2) · side2, as seen in the figure below:

Area of an octagon formula. It is a regular polygon of eight sides. Each interior angle of the octagon measures 135° and the sum of all the interior angles of an octagon equals 108°.