Holt Geometry
6-1
Properties and Attributes of Polygons
Holt Geometry
6-1
Properties and Attributes of Polygons
Find and use the measures of exteriorangles of polygons.
Objectives
Holt Geometry
6-1
Properties and Attributes of Polygons
An exterior angle is formed by one side of apolygon and the extension of a consecutive side.
Remember!
Holt Geometry
6-1
Properties and Attributes of Polygons
Note 43
Holt Geometry
6-1
Properties and Attributes of Polygons
Example 4A: Finding Interior Angle Measures andSums in Polygons
Find the measure of each exterior angle of aregular 20-gon.
Holt Geometry
6-1
Properties and Attributes of Polygons
Example 4B: Finding Interior Angle Measures andSums in Polygons
Find the value of b in polygonFGHJKL.
Holt Geometry
6-1
Properties and Attributes of Polygons
Find the measure of each exterior angle of aregular dodecagon.
Check It Out! Example 4a
Holt Geometry
6-1
Properties and Attributes of Polygons
Check It Out! Example 4b
Find the value of r in polygon JKLM.
Holt Geometry
6-1
Properties and Attributes of Polygons
1. Name the polygon by the numberof its sides. Then tell whether thepolygon is regular or irregular,concave or convex.
2. Find the sum of the interior anglemeasures of a convex 11-gon.
Lesson Quiz
nonagon; irregular; concave
1620°
3. Find the measure of each interior angle of aregular 18-gon.
4. Find the measure of each exterior angle of aregular 15-gon.
160°
24°