Detailed lesson plan sss congruence postulate

Gov. Alfonso D. Tan College

Teacher Education Department

Maloro, Tangub City

Demonstrator : Elton John B. Embodo

Subject Matter : SSS (Side-Side-Side) Congruence Postulate

Cooperating School : Sta. Maria National High School

Critic Teacher : Mr. Roland B. Amora

Principal : Mrs. Efleda D. Enerio

I. Objectives : At the end of the lesson, students are expected to:

a. complete the congruent marks to illustrate that the

triangles are congruent through SSS Congruence

Theorem;

b. match the given sides of triangles to show that the

triangles are congruent through SSS Congruence

Postulate;

c. describe the importance of equality in the society.

II. Subject Matter: SSS (Side-Side-Side) Congruence Postulate

Reference: Mathematics Learner’s Module for Grade 8 page (357)

Skills: drawing, analyzing and solving

Values: unity and cooperation

III. Materials: ruler, pencil, bond paper and cardboard

IV. Procedure: 4A’s Method

Teacher’s Activity Students’ Activity

A. Preparation

a. Review

(prayer)

(greetings)

(announcing of classroom rules)

(checking of attendance)

(collecting of assignment)

Before we proceed to our new lesson for today,

let’s have first a review about our lesson last

meeting

What did we discuss last meeting?

Yes Joyce!

Very good!

Who can recall what ASA Congruence

Postulate is?

Yesterday, we discussed about ASA

Congruence Postulate.


Yes Evan!

Absolutely!

Who wants to go to the board and illustrate the

ASA Congruence Postulate?

Yes Rodan!

Very good!

The and are congruent since

and and it

refers to ASA Congruence Postulate.

a. Motivation

Now class, I have here two triangles made

from cardboard material. One is colored blue

and the other one is colored yellow.

Class, do you know on how to determine the

congruence of these two triangles colored blue

and colored yellow by dealing only on their

sides not the angles?

ASA Congruence Postulate states that, “If the

two angles and the included side of one

triangle are congruent to the corresponding two

angles and the included side of another

triangle, then the triangles are congruent.

(student does as told)

No, Sir!

A

BC

X

Y Z

Teacher’s Activity

Students’ Activity

B. Activity

So be with me this morning as I’ll discuss to

you the “SSS Congruence Postulate.”

Everybody read!

a. Statement of the Aim

*complete the congruent marks to illustrate

that the triangles are congruent through SSS

Congruence Postulate;

*match the given sides of triangles to show that

the triangles are congruent through SSS

Congruence Postulate;

* describe the importance of equality in the

society.

Now, I’ll group you into 4 groups and form a

circle with your group. All you have to do

class is to draw the desired figure through the

following procedures being flashed on the

screen.

Do you get me class?

When you are already finished, you have to say

with action, “Clap, clap, clap Champion”! The

group which can finish first will be the winner

and will receive a secret price.

I’ll give you five minutes to do it and your

time will start now.

“SSS Congruence Postulate”

Yes Sir.

Students do as told.


C. Analysis

I want somebody from group 1 to draw their

figure on the board.

Yes Lovely

Is there somebody from group 2 to draw their

figure on the board?

Yes Apple

Is there any representative from group 3 to

discuss the work of group 1?

Yes Adrian

How about from group 4 to discuss the work of

the group 2.

Yes Rodan

Very good!

Let’s name the other triangle as .

Do the following in your group:





1. Draw a straight horizontal line segment and name it as

having a length of 15cm.

2. On the Point S of the line

segment , draw a vertical line segment and name it as

having a length of 20cm.

3. Connect the point U and T to form a new diagonal line

segment named having a measure of 25cm.

4. Name the newly formed triangle as and indicate the measures of the three sides of .


What side of corresponds with the side

of ?

Yes Aaron

Very good!

Since, sides and are corresponding

sides, what then have you observed about their

measures?

Yes Cheyenne

That’s right

If they have the same measure, then how are

we going to describe them?

Yes Annie

That’s correct!

What side of corresponds with the side

of ?

Yes Sunshine

Very good!

How are you going to describe the two

corresponding sides: and ?

Yes Panfy

Exactly!

So now, how are you going to describe the last

pair of sides; and ?

It is the side .

and have the same measure.

The two sides are congruent.

It is the side .

and are corresponding and congruent

sides because they have the same measure.

U

ST

O

M N

20cm20cm

25cm25cm

15cm 15cm


Yes Ellajane

Absolutely!

D. Abstraction

Based from the information, can we now

determine that the and are

congruent?

Then, why did you say “yes”?

Any idea?

Yes Evan!

Amazing!

Based from Evan’s answer, how are you going

to state the SSS (Side-Side-Side) Congruence

Postulate?

Yes, Lovely

Exactly!

Who else?

Yes Sunshine

Very good!

Now, how are you going to illustrate the SSS

and are corresponding sides and they

are also congruent because they have the same

measures, both of which is 25cm.

Yes Sir

We can now determine that the and

are congruent because the three sides

of are corresponding and congruent to

the three sides of .

SSS Congruence Postulate

If the three sides of a traingle are

conrresponding and congruent to the three

sides of the other triangle, th the two triangles

are congruent.

SSS Congruence Postulate

If the three sides of a traingle are congruent to

the three sides of another triangle, then they are

congruent.

Congruence Postulate? Who wants to volunteer

to go to the board and illustrate the SSS

Congruence Postulate?


Yes Adrian

Very good!

For your better understanding, here is now the

exact statement of the SSS Congruence

Postulate.

Everybody read!

Values Integration

A while ago class, we’ve discussed about SSS

Congruence Postulate and we were able to

determine the Congruence of triangles through

this certain congruence Postulate.

Class, have you noticed the word congruence?

What word can you associate with the term,

congruence class?

That’s right!


Student does as told.

SSS (Side-Side-Side) Congruence Postulate

If the three sides of one triangle are congruent

to the corresponding three sides of another

triangle, then the triangles are conguent.

Example:

If , and then

.

Yes sir

It is similar with the word equality, sir.

Students’ Activity

T

SO N P

U

So, class how important is equality in the

society?

Yes Janniah!

You have the idea!

Class, what if one family needs more remedy

from the government than the other families,

should the government give more remedy to

that certain family?

Why did you say yes?

Yes, Sunshine!

That’s right!

Let me show you this picture to you.

Your answers are related to this picture.

So it is not enough that every family receives

equal amount of remedy from the government

when one family needs more than the other do.

So, to make them more equal, the government

should give more remedy to the family which

needs more.


For me, equality is very important in order for

the people in the society to be equal. In terms

of benefits from the government, whenever a

family receives remedy from the governement,

the other families will also receive. In that way,

they will be equal.

Yes Sir

To make every family fair, the government

should give more remedy to certain family

which needs more help than the other families.

Students’ Activty

“Equality has become synonymous with

“levelling the playing field.” So let’s make

equity synonymous with “more for those who

need it.”

Do you get me class?

E. Application

How important are congruent triangles in real

world class? How are they being applied?

Yes Evan!

Amazing!

What a nice answer!

Activity 1

Directions: Complete the congruent marks of

the following pairs of triangles to

illustrate that they are congruent

through SSS Congruence

Postulate.

1.

2.

Yes Sir

Traingles are ver important since they are

useful in constructing geometric structures like

bridges, houses, hospitals, buildings and other

establishements that involve triagles. They

served as the basic foundation to make the

structures strong, balance and safe.


3.

4.

5.


V. Evaluation

Directions: Match the given sides in Column A

to their corresponding side in column B to

show that the following pairs of triangles are

congruent through SSS Congruence Postulate.

1. e

2. d

3. c

4. b

Column A Column B

1.

,

2.

3. ,

4.

5.

I. Assignment

Directions: In a one-half crosswise, prove that

and are congruent through SSS Congruence

Postulate. Give at least three statements with

corresponding reasons. Make it in a tabular form.

Pass it next meeting.

5. a