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**Warm-Up Draw an example of a(n)…**

Quadrilateral Pentagon Octagon and list how many sides the figure has.

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**Properties and Attributes of Polygons**

Geometry 6-1 Properties and Attributes of Polygons

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**Definition Polygons Not Polygons**

A polygon is a closed plane figure formed by three or more segments that intersect only at their endpoints. Polygons Not Polygons

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Parts of a Polygon Each segment that forms a polygon is a side of the polygon. The common endpoint of two sides is a vertex of the polygon. A segment that connects any two nonconsecutive vertices is a diagonal.

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Names of Polygons

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**Determine whether a figure is a polygon**

Determine whether a figure is a polygon. If it is, name it by number of sides polygon, hexagon polygon, heptagon

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polygon, nonagon not a polygon

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Definitions A regular polygon is one that is both equilateral and equiangular. If a polygon is not regular, it is called irregular. A polygon is concave if any part of a diagonal contains points in the exterior of the polygon. If no diagonal contains points in the exterior, then the polygon is convex.

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**Tell whether the follow polygons are regular/irregular and concave/convex.**

irregular, convex regular, convex

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irregular, concave regular, convex

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**Finding the Sum of the Interior Angles of a Polygon**

Step 1: Draw all possible diagonals from one vertex to the other vertices. Step 2: Multiply the number of triangles by 180°. (3) x 180° = 540°

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**Finding the Sum of the Interior Angles of a Polygon**

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Example Find the sum of the interior angles of a heptagon.

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Example Find the measure of each interior angle of a regular 16-gon.

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Example Find the value of c.

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**Measure of Exterior Angles**

Example: Find the measure of each exterior angle of a regular hexagon.

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