Even though the depth of a sheet of paper is thin, it is a 3-dimensional object. Students sometimes consider a sheet of paper or plastic as a 2-dimensional shape when it is not. What are the real-life samples of 2-dimensional geometric shapes?Ģ-dimensional geometric shapes are used to model real-world objects. Meanwhile, an irregular decagon is a 10-sided polygon where no sides and no interior angle are equal. In a regular decagon, all sides are equal and the measure of each interior angle is 144°. If the sides and interior angles are not equal, then it is an irregular nonagon.Ī decagon is a 10-sided polygon where the sum of all its interior angles is equal to 1440°. The measure of each interior angle of a regular nonagon is 140°. If all sides and interior angles of a nonagon are all equal, then it is a regular nonagon. If the sides and angle measure of an eight-sided polygon is not equal, it is called an irregular octagon.Ī nonagon is a 9-sided polygon where the sum of the interior angle is 1260°. In a regular octagon, all sides are equal and each interior angle measures exactly 135°. Irregular hexagon does not have equal sides and angles.Īn octagon is an 8-sided polygon where the sum of all the interior angles is 1080°. It is said to be a regular heptagon if all seven sides and seven angle measures are equal. The sum of all interior angles of a heptagon is 900°. On the other hand, the irregular hexagon does not have equal sides and angles. The measure of each of the interior angles of a regular hexagon is 120°. A regular hexagon is a six-sided polygon where all sides and interior angles are equal. The sum of all interior angles of a hexagon is 720°. The table below shows more kinds of regular and irregular polygons. A pentagon is said to be a concave pentagon if at least one of the vertex is pointing inwards.A convex pentagon is a pentagon where all fives vertices are pointing outwards.Every triangle has three sides, three vertices, and three angles. A triangle is formed when three straight lines meet. TriangleĪ triangle is a closed, two-dimensional shape with three straight sides. Let’s take a look at some of the polygons and define their characteristics. ![]() Some common types of polygons are triangle, square, rectangle, pentagon, hexagon, etc. The properties and kinds of polygons differ depending on the number of sides it has.
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