Geometry Geometry VocabularyVocabularyLesson #4Lesson #4

Geometry Geometry VocabularyVocabularyLesson #4Lesson #4

PolygonsPolygons

#27 Polygon#27 Polygon A closed shape with 3 A closed shape with 3 or more straight sidesor more straight sides

#28 Regular Figure#28 Regular Figure

A polygon with congruent sides and A polygon with congruent sides and anglesangles

#29 Irregular Figure#29 Irregular Figure

A polygon that does not have congruent A polygon that does not have congruent sides and anglessides and angles

Examples:Examples:

#30 Triangle#30 Triangle A 3-sided polygonA 3-sided polygon Tri- means 3Tri- means 3 Like tricycleLike tricycle

#31 #31 QuadrilateralQuadrilateral

A 4-sided polygonA 4-sided polygon Quad- means 4Quad- means 4 Like quadrupletsLike quadruplets

#32 Pentagon#32 Pentagon A 5-sided polygonA 5-sided polygon Penta- means 5Penta- means 5 Like “The Pentagon”Like “The Pentagon”

#33 Hexagon#33 Hexagon A 6-sided polygonA 6-sided polygon Hexa- means 6Hexa- means 6

#34 Octagon#34 Octagon An 8-sided polygonAn 8-sided polygon Octo- means 8Octo- means 8 Like OctopusLike Octopus

STOP

#35 Decagon#35 Decagon A 10-sided polygonA 10-sided polygon Deca- means 10Deca- means 10 Like decadeLike decade

10Deca-Decagon

4Quad-Quadrilateral

5Penta-Pentagon

6Hexa-Hexagon

3Tri-Triangle

8Octa-Octagon

# of SidesPrefixPolygon

#36 Perimeter#36 Perimeter The distance around a The distance around a polygon found by polygon found by adding the lengths of adding the lengths of all sidesall sides

4 ft

7 ft 5 inWhat is the perimeter?7 ft 5 in

7 ft 5 in4 ft4 ft+

22 ft 10 in

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