Name the two-dimensional shape

Learning Objectives Identify and name common two-dimensional shapes. Distinguish between polygons and non-polygons. Count the number of sides and vertices of a given polygon. Classify polygons based on their number of sides. Differentiate between regular and irregular polygons. Describe key properties of basic two-dimensional shapes. Look around you! 👀 Can you spot any flat shapes on your desk, on the wall, or even in a book? We see two-dimensional shapes everywhere! In this lesson, you'll become an expert at identifying and naming these flat shapes, also known as two-dimensional (2D) shapes. Understanding these shapes is a fundamental skill that helps us describe the world around us and build more complex geometric ideas. Real-World Applications Designing buildin...

TermDefinitionExample Two-Dimensional (2D) ShapeA flat shape that has only length and width, but no depth. It can be drawn on a piece of paper.A square drawn on a whiteboard, a circle on a pizza. PolygonA closed 2D shape made up of three or more straight line segments (sides) that do not cross each other.A triangle, a square, a hexagon are all polygons. A circle is NOT a polygon because it has no straight sides. SideA straight line segment that forms part of the boundary of a polygon.A triangle has 3 sides. A square has 4 sides. Vertex (Vertices)A point where two or more sides of a polygon meet. It's often called a 'corner'.A triangle has 3 vertices. A square has 4 vertices. Regular PolygonA polygon where all sides are equal in length AND all interior angles are equal in me...

Polygon Identification Rule A 2D shape is a polygon if and only if it is closed, made entirely of straight line segments, and its sides do not intersect except at the vertices. Use this rule to determine if a given shape qualifies as a polygon before trying to name it. If it has curves or is open, it's not a polygon. Polygon Naming Rule by Sides Polygons are named based on the number of sides (and vertices) they have. For $n$ sides, the polygon is named accordingly: - 3 sides: Triangle - 4 sides: Quadrilateral - 5 sides: Pentagon - 6 sides: Hexagon - 7 sides: Heptagon - 8 sides: Octagon - 9 sides: Nonagon - 10 sides: Decagon Count the number of straight sides of the polygon. This count directly tells you the polygon's name. The number of vertices will alway...