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Geometry Vocabulary Lesson #4

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Geometry Vocabulary Lesson #4

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  1. Geometry VocabularyLesson #4 Polygons

  2. #27 Polygon • A closed shape with 3 or more straight sides

  3. #28 Regular Figure • A polygon with congruent sides and angles

  4. #29 Irregular Figure • A polygon that does not have congruent sides and angles

  5. Examples:

  6. #30 Triangle • A 3-sided polygon • Tri- means 3 • Like tricycle

  7. #31 Quadrilateral • A 4-sided polygon • Quad- means 4 • Like quadruplets

  8. #32 Pentagon • A 5-sided polygon • Penta- means 5 • Like “The Pentagon”

  9. #33 Hexagon • A 6-sided polygon • Hexa- means 6

  10. STOP #34 Octagon • An 8-sided polygon • Octo- means 8 • Like Octopus

  11. #35 Decagon • A 10-sided polygon • Deca- means 10 • Like decade

  12. Polygon Prefix # of Sides Triangle Tri- 3 Quadrilateral Quad- 4 Pentagon Penta- 5 Hexagon Hexa- 6 Octagon Octa- 8 Decagon Deca- 10

  13. + #36 Perimeter • The distance around a polygon found by adding the lengths of all sides What is the perimeter? 7 ft 5 in 7 ft 5 in 7 ft 5 in 4 ft 4 ft 4 ft 22 ft 10 in

  14. #37 Diagonal • A line that goes from one vertex to another, but is NOT an edge