Information about Classifying Polygons

8-5 Classifying Polygons Warm Up 1. How do you name a ray? Under the ray symbol, name first the endpoint and then any other point on the ray. 2. What is the measure of an obtuse angle? between 90° and 180° 3. How do you name a line? Under the line symbol, name any two points on a line. 4. What is true of supplementary angles? The sum of their measures is 180°. Course 2

8-5 Classifying Polygons Problem of the Day Draw a polygon with 10 congruent sides. Make 5 of the angles acute angles and the other 5 reflex angles (greater than 180°). Possible answer: Course 2

8-5 Classifying Polygons Learn to identify and name polygons. Course 2

8-5 Classifying Polygons Insert Lesson Title Here Vocabulary polygon regular polygon Course 2

8-5 Classifying Polygons Triangles and rectangles are examples of polygons. A polygon is a closed plane figure formed by three or more line segments. Each line segment forms a side of the polygon, and meets, but does not cross, another line segment at a common point. This common point is a vertex of a polygon. Side The polygon at left has six sides and six Vertex vertices. Remember! Vertices is plural for vertex. Course 2

8-5 Classifying Polygons Additional Example 1: Identifying Polygons Determine whether each figure is a polygon. If it is not, explain why not. A. The figure is a polygon. It is a closed figure with 4 line segments. Course 2 B. The figure is not a polygon. It is not a closed figure.

8-5 Classifying Polygons Additional Example 1: Identifying Polygons Determine whether each figure is a polygon. If it is not, explain why not. C. The figure is not a polygon. The figure is not formed by line segments. Course 2 D. The figure is not a polygon. There are line segments in the figure that intersect.

8-5 Classifying Polygons Check It Out: Example 1 Determine whether each figure is a polygon. If it is not, explain why not. A. The figure is a polygon. It is a closed figure with 5 line segments. Course 2 B. The figure is not a polygon. It is not a closed figure.

8-5 Classifying Polygons Check It Out: Example 1 Determine whether each figure is a polygon. If it is not, explain why not. C. The figure is not a polygon. The figure is not formed by line segments. Course 2 D. The figure is not a polygon. There are line segments in the figure that intersect.

8-5 Classifying Polygons Polygons are classified by the number of sides and angles they have. Triangle 3 sides 3 angles Heptagon 7 sides 7 angles Course 2 Quadrilateral 4 sides 4 angles Octagon 8 sides 8 angles Pentagon 5 sides 5 angles Nonagon 9 sides 9 angles Hexagon 6 sides 6 angles Decagon 10 sides 10 angles

8-5 Classifying Polygons Additional Example 2: Classifying Polygons Name each polygon. A. B. Octagon Course 2 Quadrilateral

8-5 Insert Lesson Title Here Classifying Polygons Check It Out: Example 2 Name each polygon. B. A. Quadrilateral Course 2 Pentagon

8-5 Insert Lesson Title Here Classifying Polygons A regular polygon is a polygon in which all sides are congruent and all angles are congruent. Course 2

8-5 Classifying Polygons Additional Example 3: Identifying and Classifying Regular Polygons Name each polygon and tell whether it is a regular polygon. If it is not, explain why not. A. The figure is a regular quadrilateral. A regular quadrilateral is also called a square. Course 2 B. The figure is a quadrilateral. It is not a regular polygon because all of the sides are not congruent.

8-5 Insert Lesson Title Here Classifying Polygons Check It Out: Example 3 Name each polygon and tell whether it is a regular polygon. If it is not, explain why not. A. B. The figure is a triangle. It is The figure is a regular not a regular polygon because triangle. all sides and angles are not congruent. Course 2

8-5 Classifying Polygons Insert Lesson Title Here Homework Textbook PG 468 1-18 Course 2

8-5 Classifying Polygons Insert Lesson Title Here Lesson Quiz: Part II Determine whether each figure is a polygon. If it in not, explain why not. Name each polygon. 4. no; curved lines 5. Tell whether each figure above is a regular polygon. If it is not, explain why not. 1: No, all sides and angles are not congruent. 2, 4: No, they are not polygons. 3: Yes Course 2 t

To understand what is a polygon. Then to understand how to classify polygons by the number of sides they have, if they are concave or convex, and if they ...

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Lesson 5: Classifying Polygons Objective: Classify polygons as pentagons, hexagons, heptagons, octagons, nonagons, and decagons. Review these terms:

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Identifying and Classifying Polygons. When people hear the word geometry, they tend to think about shapes. These shapes surround their lives each and every ...

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Classifying Polygons. Exhibit your knowledge of 2D shapes and search for similar characteristics. This interactive diagram focuses on sorting polygons by ...

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Classifying Polygons Objective; I can describe a polygon How can we describe this shape? Are there any right angles? How many sides? Is it regular?

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PowerPoint-turned-video to help my students with the classification of polygons

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A superb game for Fifth Grade students to teach them about 'classifying polygons' in a fun-filled way. In this game, kids have to identify simple ...

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Geometry Worksheets Quadrilaterals and Polygons Worksheets. Here is a graphic preview for all of the Quadrilaterals and Polygons Worksheets Sections.

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Fun math practice! Improve your skills with free problems in 'Identify and classify polygons' and thousands of other practice lessons.

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Quadrilaterals. Quadrilateral just means "four sides" (quad means four, ... In fact it is a 4-sided polygon, just like a triangle is a 3-sided polygon, ...

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