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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