![]() 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. Polygon: A polygon is a 2D shape with straight sides.What are the different types of 2-dimensional geometric shapes? Kite: A quadrilateral with two pairs of sides that are same length. One pair of diagonally opposite sides is equal. Parallelogram: A quadrilateral with both pairs of opposite sides parallel and both pairs an equal length. Trapezium: A quadrilateral with one pair of parallel sides. (Differs from a square in that angles are NOT 90˚). Rhombus: A quadrilateral with both pairs or opposite sides parallel and all sides equal length. Right-angled triangle: A triangle that has a right angle. Scalene triangle: A triangle with 3 sides that are all unequal. Isosceles triangle: A triangle with 2 equal sides.
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