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Lesson 62. Visualizing, Naming and Describing Polygons with 5 or �More Sided Polygons� �

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parallel lines

intersecting lines

ray

line segment

perpendicular lines

DRILL:

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Mechanics:

a. Group the pupils into 4’s.

b. Distribute envelopes with geometric figure to each group such as drawings of parallel lines, intersecting lines, ray, line segment, perpendicular lines.

c. As the teacher flashes the words, the pupils will get from the envelope the geometric figures and put it on the board assigned for the groups.

 

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Review� “What am I” – kinds of angles� The teacher flashes a card with the following questions. Let it be answered by the pupils.�

I measure less than 90°.

I measure 110°

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I measure 90°

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I measure 18°

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I measure more than 90° but less than 180°

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What do you see class?

How many sides are there in thepicture?

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Present these figures using a geoboard

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How many sides are there in the polygon shown in the geoboard?�

What do you call a polygon with 5 sides?

6 sides?

7 sides?

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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.�

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Cutout

Number of sides

Name of polygon

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5 sides

 

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Processing the Activities:� Call a leader to report for the group.�

What are the different kinds of polygon?

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How are they identified?

Present the chart of the different kinds of polygon.

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Summarizing the Lesson�What are polygons?

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  • Polygons are closed plane figure that formed by the line segments that meet only at their endpoints. The line segments are the sides and the endpoints where sides meet are the vertices.
  • Polygons are classified according to the number of their sides and angles.

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Assessment� Match column A with column B.�

A B

1.a polygon with 5 sides a. pentagon

2. a polygon with 10 sides b. octagon

3. a polygon with 8 sides c. nonagon

4. a polygon with 6 sides d. hexagon

5. a polygon with 9 sides e. decagon

 

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Home Activity

 

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Complete each statement.

a. Dodecagon has ____ angles

b. a nonagon has _____ vertices

c. an octagon has _____ angles

d. A decagon has _____ vertices

e. A heptagon has _____ sides

 

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