SEMI-DETAILED LESSON PLAN
School:
Teacher
Date:
I. OBJECTIVES
A. Content Standards
Central National High School
Alven F. Argel
March 2024
B. Performance Standards
The learners should be able to:
is able to create models of plane figures and formulate and solve
accurately authentic problems involving sides and angles of a
polygon.
Learning Competency: constructs triangles, squares, rectangles,
regular pentagons, and regular hexagons. (M7GE-IIIh-i-1)
Learning Objectives:
C. Learning Competencies
and Objectives
Grade level:
Learning area:
Quarter:
7
Mathematics
3rd
The learners demonstrate an understanding of:
Demonstrates understanding of key concepts of geometry of shapes and
sizes, and geometric relationships.
1. Identify the sides, lengths, and angles of the triangle;
2. Constructs triangles with side, lengths, and angles; and
3. Apply the triangles in real-life situation.
II. CONTENT: Construct polygons
III. LEARNING RESOURCES
A. References
1. Teachers guide Pages
2. Learner’s Material Pages
pp. 5-7
3. Textbook Pages
4. Additional Materials
Power point, chalk, blackboard, compass, ruler or straight edge, colored
paper
B. Other Learning Resources
IV. PROCEDURES
Preliminary Activities
1. Greetings
2. Prayer
3. Cleanliness
4. Orderliness (sitting arrangement)
the teacher review the construction of the parallels and perpendiculars
using compass and straight edge.
A. Elicit
Reviewing previous lesson
or presenting the new lesson
The teacher provide a cut colored paper (different triangle) and let the
B. Engage
Establishing a purpose for the students measure it using compass and construct it in one short bond paper.
lesson
C. Presenting examples or
instances of the new lesson
the students present their work on board per polygon (triangle, square,
rectangle, regular pentagon, and regular hexagon). The teacher do a follow
up questions:
how did you form that kind of polygon?
What are the ways and techniques did you use to form that polygon?
Explain.
After the presentation, the teacher asked the students about the topic for
today and the teacher states the learning objectives of the lesson.
D. Discussing new concepts CONSTRUCTION 1: CONSTRUCT A TRIANGLE WITH SIDES
and practicing new skill #1
LENGHTS a, b, and c
STEPS:
1. Given: three segments whose lengths are a, b, and c
c
b
a
2. Draw line segment AP. Place the point of the compass on point A
and adjust its opening equal to c, intersecting line segment AP at
point B. Then AB=c
A
c
B
P
3. with the point of the compass still in point A, adjust its opening equal
to b and draw an arc above the line
A
c
B
P
4. place the point of the compass on point B and adjust its opening equal
to a. draw an arc intersecting the arc in step 3 at point C.
C
A
c
B
P
5. connect points A and C and point B and C. hence you have ∆ABC
with AB= c, AC= b, and BC= a
C
A
c
B
P
The teacher give an example of construction of a triangle given the three
segments a, b, and c
E. Discussing new concepts
and practicing new skill #2
CONSTRUCTION 2: construct a triangle with side lengths a and b
and the included angle A
1. given: two segments with lengths and b and the included angle A
c

b

A
2. copy <A. let the sides of <A be line segments AP and AQ.
Q
A
P
3. With the compass point on point A, adjust the compass width equal
to c and draw an arc on segment AP. Mark point B
Q
A
C
B P
4. With the compass point still on point A, adjust the compass with
equal to b and draw an arc on segment A. Mark point C.
b
A
C
C
Q
B P
5. Connect points B and C to form ∆ABC
Q
b
A
F. Developing Mastery
(Leads to Formative
Assessment)
C
B P
LET’S TRY!
Construct the triangle given sides a and b and the included angle A
A
a
b
G. Finding practical
applications of concepts and
skills in daily living
The teacher asked the student where can we apply the construction of the
triangle in real life situation. (Architecture, engineering, carpentry)
H. Finding generalizations/
abstractions about the lesson
Integration of the topic: Arts, TLE (measurement, gardening,
carpentry)
The teacher asked the students about the different steps in constructing a
triangle.
I. Evaluate Learning
Instruction: identify and construct a triangle given the following
1.
a
b
c
2.
a
b
J. Additional activities for
application or remediation
V. REMARKS
VI. REFLECTIONS
A. No. of learners who
earned 80% in the
evaluation
B. No. of learners who
require additional activities
for remediation who scored
below 80%
C. Did the remedial lessons
work? No. of learners who
have caught up with the
lesson
D. No. of learners who
continue to require
remediation
E. Which of my teaching
strategies worked well? Why
did this work?
F. What difficulties did I
encounter which my
principal or supervisor can
help me solve?
A
ASSIGNMENT
Look around inside your house, list all the thing where triangle is applied.
Make a short reflection why construction of triangle is important.
G. What innovation or
localized materials did I
use/discover which I wish to
share with other teachers?
Prepared by:
Alven F. Argel
Student-Teacher
Checked by:
Raenalyn M. Supetran
Teacher III
Reviewed by:
Star L. Cabayao
Head Teacher II
Noted by:
Jeruel I. Vasquez
Principal IV