# Lesson (1-6): Polygons_ p: 45 A polygon is a closed figure whose sides are all segments that intersect only at their endpoints examples polygonnot a polygon:

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Lesson (1-6): Polygons_ p: 45 A polygon is a closed figure whose sides are all segments that intersect only at their endpoints examples polygonnot a polygon: curved not a polygon: open

Names of polygons polygon number of sides triangle3 quadrilateral4 pentagon5 hexagon6 heptagon7 octagon8 nonagon9 decagon10 quadrilateral hexagon

Convex and Concave Polygons - If all lines drawn across a polygon cut it in exactly 2 points, then it is convex ● ● ● ● ● ● - If one line drawn across it cuts it in more than 2 points, then it is concave ● ● ● ●

- If all sides and angles of a polygon are equal, then it is regular Regular and Irregular Polygons - If not all sides and angles of a polygon are equal, then it is irregular

It is the sum of the measures of the sides of the polygon Perimeter 2 22 2 2 2 2 2 10 5 5 P= 2+2+10+2+2+5+2+2+10+2+2+5=46

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