Octagonal-shaped objects such as coins, rings, pipes, cans, water bottles, and the bottom of a drinking glass.The shape of the US Steel Building in Pittsburgh, Pennsylvania, is an irregular nonagon.The shape of Bahá’í House of Worship in Sydney, Panama, Wilmette, Kampala, and in many other places all over the world.At least one diagonal lies outside the closed figure. Concave Nonagon: Have at least one vertex pointing inwards with an interior angle greater than 180°.A convex nonagon can be both regular and irregular. No interior angle of a convex nonagon measure more than 180°, and all the diagonals lie inside the closed figure. Convex Nonagon: Have all nine vertices pointing outwards.An irregular nonagon can be both convex and concave. Irregular Nonagon: Does not have all sides equal or all interior angles equal, but the sum of all nine interior angles is equal to 1260°.It has nine lines of symmetry and rotational equilibrium of order nine. It is called a regular nonagon if all the nine sides are equal in length and it is an irregular nonagon if the nine sides have. Regular Nonagon: Has nine sides of equal length and nine interior angles, each measuring 140°, and exterior angles of 40° each. A 9-sided figure is called a nonagon or an enneagon.The formula is given below:Įxterior angle = 360°/n, here n = number of sidesĭepending on the sides, angles, and vertices, nonagon shapes are classified into the following types: The angle formed by any side of the nonagon and the extension of its adjacent side. ![]() Sum of the interior angles = (9-2) x 180°/9 One interior angle = (n-2) x 180°/n, here n = number of sides The measure of one interior angle can be obtained by dividing the sum of the interior angles by the number of sides in a nonagon. ![]() Sum of the interior angles = (9 -2) x 180° Sum of the interior angles = (n-2) x 180°, here n = number of sides The total measure of all the interior angles combined in the nonagon. The angle formed inside the nonagon at its corners when the line segments join in an end to end fashion.
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