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CCSS
G5.G.3
Understandand
that classify
attributes polygons
belonging to(including
a categorypentagons,
of twoMG 2.1
Identify, describe,
dimensional figures also belong to all subcategories of that category. For example, all
hexagons, and octagons).
rectangles have four right angles and squares are rectangles, so all squares have four
right angles.
CCSS G5.G.4
properties.
UNDERLYING SKILLS AND CONCEPTS:
visualize 2-dimensional figures;
sort 2-dimensional figures;
vocabulary for geometry
Classify two-dimensional figures in a hierarchy based on
Name and Classify Polygons
Shape Names Tell
the Number of Sides
triangles
3 sides
quadrilaterals
4 sides
pentagons
5 sides
hexagons
6 sides
Next come the quadrilaterals:
They all have 4 sides.
septagons
7 sides
octagons
8 sides
A polygon is named by the number of
sides it has.
nonagons
9 sides
decagons
10 sides
The simplest polygon is a triangle:
a triangle has 3 sides and 3 angles.
Name: Triangle Quadrilateral Pentagon Hexagon Septagon Octagon Nonagon
Number
3
4
5
6
7
8
9
of sides:
E x am p l E
Which of these is NOT a polygon? Explain why.
A
B
C
D
E
F
C is not a polygon. It does not have straight sides.
E is not a polygon because it is not closed.
F is not a polygon. Not all its sides are straight line segments.
page 266
Chapter 23 – Lesson 1
C – © CSL Associates, Inc. All rights reserved.
K
a
ey Ide
A polygon is a closed figure made
of line segments.
Polygons have at least three
angles and at least three
line segments.
Name
P RAC T I C E
Put the letter of the figure by its shape name.
If there are none, write none.
1. triangle
none
2. quadrilateral A, D, E
3. pentagon
4. hexagon
5. septagon
6. octagon
7. nonagon
C – © CSL Associates, Inc. All rights reserved.
8. decagon
B
F
none
G
none
H
A
9. Which of these are NOT
triangles?
C and D
B
E
C
F
D
G
H
10. Which of these are NOT
quadrilaterals?
A
Explain why. C because one
Explain why.
side is not straight; and D
Because it has 5 sides.
because it is not closed.
Math
Reasoning
Spatial Visualization
MR 2.3
11. Cut out these two shapes. Show 2 polygons you can make
by putting 2 of these pattern pieces together.
square, parallelogram
Chapter 23 – Lesson 1
page 267
MCX94.HW.CL.G3.FM&Lesson.v211
8/3/04
13:56
Page 178
Name
…at home!
P RAC T I C E
Put the letter of the figure by its shape name.
If there are none, write none.
1. triangle
none
2. quadrilateral H, E, D
4. hexagon
5. septagon
6. octagon
7. nonagon
8. decagon
G
C
none
B
none
A
A
9. Which of these are NOT
triangles?
C and D
B
E
C
F
D
G
H
10. Which of these are NOT
quadrilaterals?
A
Explain why. C because one
Explain why.
side is not straight; and D
Because it has 6 sides.
because it is not closed.
Math
Reasoning
Spatial Visualization
MR 2.3
11. Cut out four of this shape. Show 2 polygons you can make
by putting these 4 pieces together.
page 178
Home Resource and Homework
Chapter 23 Lesson 1
C – © CSL Associates, Inc. All rights reserved.
3. pentagon
MCX94TEG3Ch01_32.v8.9.3 2/21/01 14:50 Page 491
Name
P RAC T I C E
Put the letter of the figure by its shape name.
If there are none, write none.
1. triangle
none
2. quadrilateral A, D, E
3. pentagon
4. hexagon
5. septagon
6. octagon
7. nonagon
C – © CSL Associates, Inc. All rights reserved.
8. decagon
B
F
none
G
none
H
A
B
E
C
F
D
G
H
10. Which of these are NOT
quadrilaterals?
A
9. Which of these are NOT
triangles?
C and D
Explain why. C because one
Explain why.
side is not straight; and D
Because it has 5 sides.
because it is not closed.
Math
Reasoning
Spatial Visualization
MR 2.3
11. Cut out these two shapes. Show 2 polygons you can make
by putting 2 of these pattern pieces together.
square, parallelogram
Chapter 23 – Lesson 1
Student Book Page
page 267
Name
…at home!
P RAC T I C E
Put the letter of the figure by its shape name.
If there are none, write none.
1. triangle
none
2. quadrilateral H, E, D
4. hexagon
5. septagon
6. octagon
7. nonagon
8. decagon
G
C
none
B
none
A
A
9. Which of these are NOT
triangles?
C and D
B
E
C
F
D
G
H
10. Which of these are NOT
quadrilaterals?
A
Explain why. C because one
Explain why.
side is not straight; and D
Because it has 6 sides.
because it is not closed.
Math
Reasoning
Spatial Visualization
MR 2.3
11. Cut out four of this shape. Show 2 polygons you can make
by putting these 4 pieces together.
page 178
Home Resource and Homework
Chapter 23 Lesson 1
C – © CSL Associates, Inc. All rights reserved.
3. pentagon
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