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## Geometry Vocabulary Lesson #4

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**Geometry VocabularyLesson #4**Polygons**#27 Polygon**• A closed shape with 3 or more straight sides**#28 Regular Figure**• A polygon with congruent sides and angles**#29 Irregular Figure**• A polygon that does not have congruent sides and angles**#30 Triangle**• A 3-sided polygon • Tri- means 3 • Like tricycle**#31 Quadrilateral**• A 4-sided polygon • Quad- means 4 • Like quadruplets**#32 Pentagon**• A 5-sided polygon • Penta- means 5 • Like “The Pentagon”**#33 Hexagon**• A 6-sided polygon • Hexa- means 6**STOP**#34 Octagon • An 8-sided polygon • Octo- means 8 • Like Octopus**#35 Decagon**• A 10-sided polygon • Deca- means 10 • Like decade**Polygon**Prefix # of Sides Triangle Tri- 3 Quadrilateral Quad- 4 Pentagon Penta- 5 Hexagon Hexa- 6 Octagon Octa- 8 Decagon Deca- 10**+**#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**#37 Diagonal**• A line that goes from one vertex to another, but is NOT an edge