Polygons 5

1. Lesson 63. Describing
and Comparing
Properties of
Polygons
( Regular and
Irregular Polygons )

2. Drill
�Identify the different geometric
figures
90
°
90
°

3. . I am a 3-sided
polygon with
congruent sides
. Game : What am I?
equilateral
triangle
I have one pair of
parallel sides trapezoid

4. . All my 4 sides are
congruent and no right
angles rhombus
My 4 sides are equal.
All my sides form
Isosceles
triangle
. I am a 3- sided
polygon with 2
congruent sides
squar

5. Look at our blackboards.
Do they have the same
size and shape?
Look around the room.
What objects
have the same size and

6. . Presentation
Present these figures

7. How many sides are
there in the polygons
shown ?
What do you call a
polygon with 5
sides?
Are they the same?
Why?
How do they differ?

8. Performing the Activities
Material : cut-outs of 5-12
sided polygons.
Mechanics :
a. Group the pupils into four.
b. She or he distributes cutouts
placed in an envelope.
c. Let the pupils paste the
cutouts intended for the different

9. Cutou
t
Numb
er of
sides
Nam
e of
poly
gon
Length of
each side
(same or
not same)
6

10. Call a leader to report for the group
�. What are the
different kinds of
polygon?
� What is a regular
polygon? Irregular
polygon?

12. Summarizing the Lesson
Ask: What are polygons?
How are they classified?
Differentiate regular from irregular polygons
�Polygons are closed plane figure that
formed by the line segments that meet only
at their endpoints.
� Polygons are classified according to the
number of their sides and angles.
� Polygons may either be regular or
irregular. Regular polygons have all sides

13. Assess
ment
Name each polygon by the the number of its
sides. Tell whether it is regular or not regular
1 2 3 4 5

14. Identify each polygon. State whether it is
regular or not.
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