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VERE, Marjorie DLP IN MATH4 EP
Education (Christ the King College)
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A DETAILED LESSON PLAN IN MATHEMATICS 4
I.
OBJECTIVES
A. Content Standards:
 The learner demonstrates understanding of the concepts of parallel and
perpendicular lines, angles, triangles, and quadrilaterals.
B. Performance Standards:
 The learner is able to describe parallel and perpendicular lines, angles, triangles, and
quadrilaterals.
C. Learning Competency/Objective:
 Identifies and describes triangles according to sides and angles. (M4GE-IIIc-16)
II.
SUBJECT MATTER
A.
B.
C.
D.
III.
TOPIC: Identifying and DESCRIBING Triangles
Reference: K to 12 Grade 4 Curriculum Guide, LM Math Grade 4 pages 162 to 163.
Materials: Pictures and cutouts of different triangular objects and charts
Values Integration: Patriotism
PROCEDURES
Teacher’s Activities
Learners’ Activities
A. Preliminary Activities
1. Prayer
Let’s all stand and let us pray.
2. Greetings
Good morning children!
Please sit down.
(The pupils will stand and pray.)
Good morning Ma’am, good morning classmate,
Mabuhay!
Thank you ma’am!
3. (Checking of Attendance)
Say present if your name is called.
4. Energizer
Children, let us sing the song “It’s Math
time After All”
“the children will say present”
(the children begin to sing)
“There is just one class
We enjoy so much
Where our mind think hard
And compute a lot
Though the drill are so fast
And the problem so hard
We enjoy our class in Math.
Oh! Its math time after all
Oh! Its math time after all
Oh! Its math time after all
Come together and come all.”
Okay very good.
Thank you ma’am.
Please be seated.
5. Drill
(the teacher will conduct an activity in which
she will flash the meaning of the different
kinds of lines and angles. Whoever knows the
answer will ring the bell and tell what kinds of
angles or lines it is )
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Class! I have here, the meaning of different kinds
of lines and angles. Now, you are going to ring the
bell if you know the answer and then tell what
kinds of angles or lines it is.
(the pupils listened to the instruction of the
teachers)
Are you ready?
Yes ma’am!
1. A line that intersect and has a right
angle.
2. An angle that measure more than 90˚.
3. A line that intersect and meet at a
point.
4. An angle that measure less than 90˚.
5. A line that will never meet.
1. Perpendicular line
2. Obtuse angle
3. Intersecting line
4. Acute angle
5. Parallel line
Okay very good!
Those are the meanings of different kinds of lines
and angles.
6. Review
Now, let’s have recap about our discussion
yesterday.
What was our lesson all about?
Yes, polygon.
And when we say polygon. It is what?
Our lesson yesterday is all about polygon.
What are the 2 plane figures that we discussed?
It is a close plane figure that has sides and
angles.
Triangle and the quadrilateral.
When we say triangle and Quadrilateral, what are
they?
polygons
Yes, very good!
Yes ma’am!
What is a triangle?
Triangle is a plane figures that has 3 sides and 3
angles.
How about the Quadrilateral?
Quadrilateral is a plane figure that has 4 sides
and 4 angles.
That’s correct!
B. Developmental Activities
1. Motivation
(the teacher will show a Philippine flag)
I have here a picture
What is this?
Now scan the picture, what can you see about the
flag?
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What plane figures can you see?
Philippine flag
Yes, because it has 3 sides and 3 angles.
It has polygon
Now , let’s try to look at here
Triangle
The 3 stars that are shown in the Philippine flag
are the 3 major islands.
Now, How will you show your love and respect to
our Philippine flag?
By doing what?
That’s right.
By standing straight and face to the Philippine flag
while singing the National Anthem
What else?
Yes, very good those are only the some on how
we show love and respect to our Philippine flag.
Salute to the flag by placing our right palm over
our left chest..
Do you understand children?
By not making fun of it,
C. TEACHING/MODELING
1. Presentation
I have here a presentation, everybody read.
Yes teacher.
Ms. Fina assigned someof her pupils to
bring different objects with the shape of a
triangle. Brenilda brought a picture of a
house, Grace showed a picture of a traffic
sign, and Jocelyn prepared a triangular
flaglet.
(the students will read the situation posted)
Observed the different triangular object.
How will you describe the different triangular
objects?
Meaning, they’re all different in sides and angles.
What do we call this plane figure?
Yes, and triangles are classified according to their
sides and angles.
So, here are the Classification of an according to
their angles.
The different triangular objects that is shown has
different sizes of a triangles
(the pupils listening to the discussion)
1. RIGHT TRIANGLE
Triangle
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(listening)

Has a right angle which measures 90˚.
2. Acute Triangle

has 3 acute angles, which measures less
than 90˚. DEF is an acute triangle.
3. Obtuse angle

Has an obtuse angle which measures
more than 90˚. GHI is an obtuse triangle.
Yes ma’am!
Do you understand?
Now, Triangles are also classified
according to its sides.
1. Equilateral triangle

Has 3 equal sides.
triangle.
JKL is an equilateral
2. Isosceles triangle

Has 2 equal sides.
isosceles triangle.
MNO is an
(listening)
3. Scalene triangle

Has no equal sides.
triangles.
PQR is an scalene
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Yes!
Do you understand?
So, Triangles are classified according to its sides
and angles.
Now let’s have an activity.
D. GUIDED PRACTICE
(Group the class into 2 teams. Distribute the
cutouts paper to every group.)
1. Group Activity
 Set the standard of group activity
Everybody read.
What to do during activity:





What to do during activity:





Keep Quite
Share your ideas.
Build teamwork
Work as fast as you can
Speak politely
Keep Quite
Share your ideas.
Build teamwork
Work as fast as you can
Speak politely
That’s right!
Now , each team paste the cutouts papers given
to you in a manila paper and labeled the different
kinds of triangles according to their sides and
angles.
If your group is done, display your outputs and
present them to the class.
(the students listening to the teacher)
Are you ready class? I will give you 3 minutes to
work with it.
Start answering now.
(start answering with their group mates)
(The teacher will room and visit each group to
guide the students in working with their group
activity by teaching and instructing them what to
do)
(the group 1 will report according to what cutouts
they have)
Okay times up!
(Checking of group activity)
Post now your works and tell something about it.
Let us hear from group 1 first.
(the group 1 will report according to what cutouts
they have)
How about in group 2.
Okay very good.
Let us now compare your outputs.
Do all triangles have equal sides and angles?
No!
Because triangles are classified according to its
sides and angles.
E. INDEPENDENT PRACTICE
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Now, get a clean sheet of paper and answer the
question.
Direction: Draw a smiley face if it’s a YES and a
sad face if it is a NO.
1. Does an isosceles triangle have 2
equal sides?
2. Does an acute triangle have an
obtuse angle?
3. Does an equilateral triangle have
equal sides?
4. Does a scalene triangle have no
equal sides?
5. Does a right triangle have a right
angle?
1.
2.
3.
4.
5.
Fantastic!
F.
GENERALIZATION
So again, How are triangles classified?
Okay very good!
Triangles can be classified according to its angles
and sides.
A TRIANGLE CLASSIFIED ACCORDING TO
ANGLES AS RIGHT, ACUTE OR OBTUSE
TRIANGLE. IT CAN ALSO BE CLASSIFIED
ACCORDING TO SIDES AS EQUILATERAL,
ISOSCELES OR SCALENE TRIANGLE.
Understand?
Excellent!
Yes , ma’am
IV.
EVALUATION
DIRECTION: Name the triangle described in each item
1.
2.
3.
4.
5.
6.
V.
It is a triangle which has a right angle
It is a triangle which has an obtuse angle
It is a triangle which has 3 acute angles
It is a triangle which has 2 equal sides
It is a triangle which has no equal sides
It is a triangle which has 3 equal sides
ASSIGNMENT
Direction: Draw the following triangles correctly
1.
2.
3.
4.
5.
6.
Right triangle
Obtuse triangle
Acute triangle
Equilateral triangle
Isosceles triangle
Scalene triangle
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Prepared by:
Reviewed/Checked by:
MARJORIE RUTH M, VERE
Student Teacher
GEMMA D. PEDROSA
Cooperating Teacher
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