Polygons Only one of these is a polygon. Do you know? A polygon MUST be a closed figure.

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Presentation transcript:

Polygons Only one of these is a polygon. Do you know? A polygon MUST be a closed figure.

Polygons Only one of these is a polygon. Do you know? A polygon MUST have all straight sides.

Polygons Can you come up with a good definition of a polygon? A polygon is a closed plane figure with straight sides.

TRUE or FALSE Circles are polygons. Triangles are a type of a polygon. Rectangles are polygons. All quadrilaterals are polygons. T T T F

Polygons Time for Math Boards! Please draw ANY polygon on your board.

Polygons Polygons are classified by the number of sides they have.

NEW WORD!!!! Vertices Vertices is another word for corner. Vertex = corner Vertices = vertex plural

Polygons Can you name these polygons? How many sides? How many angles or vertices? 3 3 Triangle

Polygons Can you name these polygons? How many sides? How many angles or vertices? 4 4 Quadrilaterals

Polygons Can you name these polygons? How many angles or vertices? 5 Pentagon How many sides? 5

Polygons Can you name these polygons? How many sides? How many angles or vertices? 6 6 Hexagon

Polygons Can you name these polygons? How many sides? How many angles or vertices? 8 8 Octagon

Polygons Did you notice anything about the sides and angles of each shape? The number of angles (or vertices) and sides is the same.

Name That Polygon Triangle

Hexagon Name That Polygon

Quadrilateral

Name That Polygon Octagon

Name That Polygon Quadrilateral

Name That Polygon Pentagon