Classifying Polygons.notebook
Objective for the day: Students will identify, classify and name polygons.
Key Vocab:
Polygon:
Diagonal:
Convex polygon:
Concave polygon:
Common Names of Polygons
Sides
Name
Sides
3
9
4
10
5
11
6
12
7
8
n
Name
Classifying Polygons.notebook
YOU DO
Classifying Polygons.notebook
cgrb-0801.qxd
11/12/01
12:41 PM
Page 10
LESSON
8.1
NAME _________________________________________________________ DATE ___________
Practice A
For use with pages 411–415
Lesson 8.1
Match the type of polygon with the description.
1. convex polygon
A. polygon that is both equilateral and equiangular
2. concave polygon
B. all sides are congruent
3. equilateral polygon
C. polygon that is not convex
4. equiangular polygon
D. all interior angles are congruent
5. regular polygon
E. no line containing a side of the polygon passes through
the interior of the polygon
Decide whether the polygon is convex or concave.
6.
7.
8.
Decide whether the polygon is equilateral, equiangular, or neither.
9.
10.
11.
Decide whether the polygon is regular. Explain your answer.
12.
13.
14.
In Exercises 15–17, the polygons are equilateral. Find the perimeter of the polygon.
15.
16.
6 cm
17. 12 yd
4 ft
Use the polygon outlined on the traffic sign.
18. Decide whether the polygon is convex or concave.
19. Is the polygon regular?
10
Geometry
Chapter 8 Resource Book
Copyright © McDougal Littell Inc.
All rights reserved.
cgrb-0801.qxd
11/12/01
12:41 PM
Page 11
LESSON
NAME _________________________________________________________ DATE ___________
8.1
Practice B
For use with pages 411– 415
Complete the statement.
1. A polygon is ____
? if no line that contains a side of the polygon passes through the
interior of the polygon.
2. A polygon that is not convex is called ____
? .
3. A polygon is equilateral if all of its ____
? are congruent.
4. A polygon is equiangular if all of its ____
? are congruent.
Lesson 8.1
5. A polygon is ____
? if it is both equilateral and equiangular.
Decide whether the polygon is convex or concave.
6.
7.
8.
Decide whether the polygon is equilateral, equiangular, or neither.
9.
10.
11.
Decide whether the polygon is regular. Explain your answer.
12.
13.
14.
In Exercises 15–17, the polygons are regular. Find the value of x.
15.
16.
9
3x 6
17.
6
108
3x 2x 8
Use the polygon formed by the outline of the hourglass.
18. Decide whether the polygon is convex or concave.
19. Decide whether the polygon is equiangular, equilateral,
or regular.
Copyright © McDougal Littell Inc.
All rights reserved.
Geometry
Chapter 8 Resource Book
11