6th Grade Math Textbook, Progress

19

Geometry III

Polygons

Decide if each figure is a polygon. Write Yesor No.Then name the polygon.

6 sides

6 vertices

vertex 6 angles

side

angle

The sides of a polygon do not

cross each other.

Triangle

trimeans 3

33

Quadrilateral

quadmeans 4

44

Pentagon

pentameans 5

55

Hexagon

hexameans 6

66

Octagon

octameans 8

88

A polygon is a closed plane figure formed

by line segments that intersect only at their

endpoints. The line segments are the sides

of the polygon.

The point where any two sides of a polygon

meet is called a vertex (plural: vertices)

of the polygon.

Polygon

Number

of Sides

Number

of Vertices Examples

8206-2_1-25 2/27/06 12:18 PM Page 19