lESSON pLAN

1. Lesson Plan in Mathematics
Grade 5
Grade V – Acacia (7:50-8:50)
I. Learning Objectives
Cognitive: Visualize similarity of polygons
Identify similar polygons
Psychomotor: Illustrate similar polygons
Affective: Show enthusiasm in performing any assigned task
II. Learning Content
Skills: Visualizing similarity of polygons
Identifying similar polygons
Reference: BEC-PELC III.3 Mathematics 5: Mathematics for the Better Future,
Coronel And bamba, pp. 226-231
Materials: examples of similar polygons, PPT presentation
Value: orderliness
III. Learning Experiences
A. Preparatory Activities
1. Drill
a. Post models of different polygons on the board and ask the pupils
which of these polygons have the same shape. Ask them to name the
different polygons posted on the board.

2. 2. Review
a. Have the pupils explain when two angles or line segments are
congruent?
3. Motivation
a. Show the class objects of various sizes. Ask the pupils to arrange
these from smallest to biggest.
B. Developmental Activities
1. Presentation
a. Have the pupils observed the pictures below.
b. Ask: Is the smiley in one picture the same smiley in the other
picture? What makes the pictures different?
c. Have the pupils compare the triangles and the octagons. Ask: How
are the figures like the two pictures first observed?
d. Introduce the term similar to describe each pair of triangles and each
pair of octagons. Have them observe these figures.
Activity 1.
Tell whether the pairs of polygons are similar or not. Why or why not?

3. Ask the pupils: Answer with yes or no, explain your answer.
1. Do similar polygons have the same shape?
2. Do similar polygons have the same size?
3. Are all congruent polygons similar?
4. Are all similar polygons congruent?
e. Have the pupils observe the two quadrilaterals below.
Ask: Are the corresponding angles congruent? Explain why these two
figures are similar.
f. Have the pupils read the problem.
Follow these steps:
1. Draw GH 4 cm long since the length must be doubled.
2. Mark two points 2 cm directly above points G and H since the width must
be doubled. Label these points F and E.
3. Draw GF, FE, and EH.
4. Using a protractor, check if the angles are congruent to those of the
original.
Ask: Are rectangle ABCD and rectangle FEHG now similar?
3. Generalization
When do you say that two polygons are similar?
Two polygons are similar if:
a. have the same shape but may have different size..
b. their corresponding angles are congruent and their corresponding sides have
Willy wants to draw a rectangle similar to
the one at the left. Mrs. Reyes, his
teacher, suggests that he double the
length of each side. How can Willy draw a
rectangle?

4. equal ratios.
4. Application
1. Look at the things inside the classroom and identify the similar sides or faces.
a. books c. tables
b. chalkboard d. walls
2. Fine pairs of figures in your classroom that show similarity.
IV. Evaluation
Draw a polygon similar to each polygon. Use the indicated increase in the length of
each side.
1. increase length two times 2. Increase length 3 times
3. increase length four times
V. Assignment
Determine whether the polygons in each pair are similar.
1. 2.
3.