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. All circles have 360 degrees of angle measure.The measure of a diameter is twice the measure of a radius. It is a line segment that runs across the circle through its center. The diameter of a circle is the longest possible line segment that can be drawn in a circle.The radius is the distance from the center of the circle to any point on the circumference.The circumference is equal to the length of the wire, which in this case, is 15 cm. Assume a string with a length of 15 cm, which is bent to form a circle. The distance around a circle can be defined as its circumference.The central point is the point located at the center of a circle.The parts of a circle are the central point, radius, diameter, and circumference. We can say that a 2-dimensional shape is a circle if it a closed, completely rounded shape. The image below shows how a regular 2D shape differs from an irregular 2D shape.
If all of the sides of a 2D object are of unequal length and all angles are of unequal measure, it is considered irregular. If all of the sides of a 2D object have the same length and all interior angles are the same, it is said to be regular. When classifying a 2D shape, we need to consider the measure of the lengths of each side and its interior angles. We can classify a 2D shape as a regular and irregular shape. How can we classify a 2-dimensional geometric shape? Polygons are named and determined based on the number of sides, such as triangles, quadrilaterals, pentagon, hexagon, etc. It is made of line segments wherein each of which intersects with exactly two other line segments. PolygonĪ polygon is a closed and flat figure on a plane with straight sides. Thus, it does not meet the criteria for being a polygon. However, a circle is not a polygon, and will not be a polygon since a circle is formed by a single curved line and not from line segments. Students sometimes confuse a circle as a polygon. CircleĪ circle is a closed 2D shape whose points are always the same distance from the central point. We can classify a 2-dimensional shape depending on the number of sides, how it is formed, and by its lengths and widths. What are the different types of 2-dimensional geometric shapes?
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