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Transcript
Polygons
Standards:
3.1 Use properties and characteristics of two-and three- dimensional shapes and geometric
CSDE
theorems to describe relationships, communicate ideas and solve problems
GLE
6th Gr.
Classify sets and subsets of polygons using the relationship of the sides (length, parallel and
perpendicular) and angles (types and measure).
CMT
17A: Identify and classify two- and three- dimensional geometric shapes and figures
17B: Draw, describe and classify two-and three- dimensional geometric shapes and figures
CT ELL
2.2 Use English to read and write in the academic setting
Beginner: Classify objects according to number, shape, color, size , function and physical
characteristic
Intermediate: Classify data and information
Advanced: Develop a critical stance
Theme: Geometric figures
Lesson Topic: Polygons
Content Objective: TLW work collaboratively in groups to sort, classify, describe, and compare polygons
Language Objective: TLW use prefixes, key words (refer to PowerPoint)
To identify, compare, classify, and justify decisions orally and in writing
Cultural Objective: TLW identify polygons in various country flags
Motivation: Identify polygons in various flags from students’ cultural backgrounds, review previous concepts:
angles, line segments, congruency
Key Vocabulary: Polygon, congruent, angles, sides, lines, simple, regular
Content Concepts:
 A polygon is a closed figure formed by three or more sides
 Simple: line segments don’t cross each other
 Regular Polygons have sides and angles that are congruent
 The number of sides determines the name of the polygon
3. Triangle
4. Quadrilateral
5. Pentagon
6. Hexagon
7. Heptagon
8. Octagon
9. Nonagon
10. Decagon
Materials: Word Splash template, illustrated word wall, word sort cards, frames, vocabulary logs,
markers/crayons, comparison organizers
Supplementary Materials:
Technology:
PowerPoint: Prefixes and Polygons
PowerPoint: Word Sort Cards
www.Math.com
http://www.mathleague.com/help/geometry/polygons.htm
http://standards.nctm.org/document/eexamples/chap4/4.2/part2.htm
http://www.aaamath.com/geo318-polygons-numbers.html#section2
Practice/Application:
Word Splash
Complete individually, discuss in pairs (Think-PairShare)
Shape Sort: Is it a Polygon?
Groups of two or three students
Shape Sort: Is it a Regular or Irregular Polygon?
Groups of two or three students
Web games
Individual or in pairs
Review/Assessment:

Thumbs up/thumbs down: Is it a Polygon? Is it a regular polygon?

Number 1 to 3 Self Assessment: At the end of the lesson

Sentence frames (3) differentiated by students’ level of proficiency

Completion of group project
WORD SPLASH
(Illustrated Word Wall)
Name: _________________
Vocabulary
Word
Date: ____________________
Something that reminds me of it.
Other words I think of: __________
____________________________
What I think it means:
______________________________
______________________________
______________________________
______________________________
One good sentence (from the book):
_______________________________
_______________________________
_______________________________
_______________________________
Dictionary Definition:
______________________________
______________________________
______________________________
______________________________
Another good sentence (from my head):
_______________________________
_______________________________
_______________________________
_______________________________
Created by Jackie Matos
Shape Sort: Is it a polygon?
Print slides (six slides per page) from the Polygon Sort PowerPoint and cut to use as flash card for sorting
In pairs, students will then place each card on the appropriate box and explain how each was categorized
Date: ___________________________________
Class: ________________________
Names: __________________________________________________________________________________________
Polygon
NOT a Polygon
Why?
On the SMART Board:
 Review Polygon Prefixes PowerPoint
 Display the three polygons below
 In groups, have students discuss the polygons
 Select three groups to present their conclusions to the class
Name each polygon. Then tell if the polygon is a regular polygon.
______________________
__________________________
______________________
Polygons: Regular or Irregular?
Print slides (six slides per page) from the Polygon Sort PowerPoint and cut to use as flash card for sorting
In pairs, students will then place each card on the appropriate box and explain how each was categorized
Date: ___________________________________
Class: ________________________
Names: _________________________
_________________________
_______________________
Polygons
Regular Polygons
Irregular Polygons
NOT Polygons
Practice/Application
Web Games!!!
http://www.math.com/school/subject3/lessons/S3U2L2GL.html
Click on Step 1: Basic Polygons tutorial: Provides an interactive table where students click on the polygon’s
name and an illustration of the polygon appears. Also has key word highlighted and hyperlinked to simpler
definitions
Click on Step 2: In Depth tutorial: Provides an extension of the lesson for advanced students which includes
formulas for finding the sum of the interior angles
Click on Step 3: Examples: Provides brief explanation and illustration of how to find the sum of the angles
Click on Step 4: Workout: An online quiz that provided immediate feedback (right/wrong) and redirects
students to specific tutorials based on specific need as measured by the responses on the quiz
http://www.mathleague.com/help/geometry/polygons.htm
Reinforces lesson vocabulary though illustrations; can be used as an extension activity for mathematically
advanced students because it includes additional concepts beyond those addresses in this lesson
http://standards.nctm.org/document/eexamples/chap4/4.2/part2.htm
This site provides interactive computer geoboards where students can make as many polygons as they desire
on one geoboard using virtual rubber bands. Students are to work in pairs and discuss their creations.
http://www.aaamath.com/geo318-polygons-numbers.html#section2
This site can be used as a fun way to reinforce lesson concepts.
Click on Practice: This site requires students to “Name the Type of Polygon!” Students are provided with
attributes of a polygon and they have to select the correct type of polygon. It provides immediate feedback as
well as percent correct.
Click on Play: Students can choose from three different games: Count Down, Give me Time, 20 Questions
COMPARISON MATRIX (Guided Practice)
Figure
Conclusion/Observations:
Polygon
Not a
Polygon
Number
of Sides
Polygon Name Regular
Polygon
Irregular
Polygon
INDEPENDENT PRACTICE: Beginners
Figure
Polygon
Not a
Polygon
Number
of Sides
Polygon
Name
Regular
Polygon
Irregular
Polygon
INDEPENDENT PRACTICE: Intermediate
lines
polygons
three
polygon
intersect
measurement
regular
angles
A ______________is a figure with at least ________
sides_______________. Polygons can be ____________ or
irregular. Regular ___________ have __________and _________
that are _____________. This means that the angles and sides
have the same _______________. Examples of regular polygons
are__________________, _______________,
______________and _______________. Examples of irregular
polygons are: _______________, ,__________________, and
__________________.
INDEPENDENT PRACTICE: Beginners/intermediate
three
same
figure
polygons
A polygon is a ___________ with at least ________ line
segments that do not cross or intersect. Polygons can be regular
or irregular. Regular ______________ have congruent angles and
lines. This means that the angles and lines have the _________
measurement.
Application:
United States
a. How many polygons can you identify in the flag of the United States?
__________________________________________________________
b. How many are regular polygons? Why? Name them.
__________________________________________________________
c. How many are irregular? Why? Name them
__________________________________________________________
Flags
How many polygons can you identify? Name them.
ALBANIA
EGYPT
INDIA
HAITI
CHINA