Lesson 63 �Describing and Comparing Properties of Polygons �( Regular & Irregular Polygons)

Drill

• Identify the different geometric figures

90°

90°

I am a 3-sided polygon with congruent sides

Game : What am I?

equilateral triangle

I have one pair of parallel sides

trapezoid

All my 4 sides are congruent and no right angles

rhombus

My 4 sides are equal. All my sides form right angles

Isosceles triangle

I am a 3- sided polygon with 2 congruent sides

square

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Look at our blackboards.�Do they have the same size and shape?� �

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Look around the room.

What objects have the same size and shape?

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. Presentation� Present these figures

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?

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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 column as shown below.� �

Call a leader to report for the group

• . What are the different kinds of polygon?

• What is a regular polygon? Irregular polygon?

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 congruent. Irregular polygons have noncongruent sides.

Assessment

Name each polygon by the the number of its sides. Tell whether it is regular or not regular

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5

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

Home Activity

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