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# Geometry 2-6

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### Geometry 2-6

1. 1. P O L Y G O N S 2-6
2. 2. DEFINITION <ul><li>A POLYGON is </li></ul>the union of segments in the same plane such that each segment intersects exactly two others at their endpoints . Hint: there are 4 separate phrases in the definition -- memorize it!
3. 3. TERMS: <ul><li>Sides - </li></ul><ul><li>Vertex – </li></ul><ul><li>Consecutive vertices/sides or </li></ul><ul><li>Adjacent vertices/sides - </li></ul><ul><li>Diagonal - </li></ul>the segments in the polygon. the endpoints of the segments. endpoints of the same segment or sharing a point a segment connecting NON-adjacent vertices.. H E O S U
4. 4. DEFINITION <ul><li>A POLYGONAL REGION is </li></ul>the union of the polygon and its interior.
5. 5. Names of Polygons: <ul><li>Know 3 sides up to 10 sides and 12 sides. </li></ul>3 - TRIANGLE
6. 6. Names of Polygons: 4 - QUADRILATERAL
7. 7. Names of Polygons: 5 - PENTAGON
8. 8. Names of Polygons: 6 - HEXAGON
9. 9. Names of Polygons: 7 - HEPTAGON
10. 10. Names of Polygons: 8 - OCTAGON
11. 11. Names of Polygons: 9 - NONAGON 10 - DECAGON 12 - DODECAGON
12. 12. TRIANGLES: <ul><li>Equilateral </li></ul><ul><li>Isosceles </li></ul><ul><li>Scalene </li></ul><ul><li>- ALL sides equal </li></ul>- TWO sides equal - NO sides equal
13. 13. HIERARCHY TREE: FIGURE POLYGON TRIANGLE SCALENE ISOSCELES EQUILATERAL
14. 14. HOMEWORK #1-14, #26