Republic of the Philippines
Department of Education
Cordillera Administrative Region
Schools Division of Benguet
ALEJO M. PACALSO MEMORIAL NATIONAL HIGH SCHOOL
Bua, Tuding, Itogon, Benguet
Teacher: Shirley D. Totanes
Quarter: 3
Content Standard
Performance Standard
Competency:
LESSON PLAN IN MATHEMATICS 9
APRIL 7, 2022
Subject: Mathematics
Grade Level: 9
The learner demonstrates understanding of key concepts of triangle similarity (theorems of
proportionality)
The learner is able to investigate, analyze, and solve problems involving triangle similarity
through appropriate and accurate representation.
a. describes a proportion ( M9GE-IIIf-1)
b. applies the fundamental theorems of proportionality to solve problems involving
proportions. (M9GE-IIIf-2)
I. Objectives
a. describes a proportion.
b. applies the fundamental theorems of proportionality to solve problems involving
proportions.
II. Content
III. Learning Resources
GEOMETRY: PROPORTION INVOLVING TRIANGLES
Teacher’s Guide (TG) in Mathematics 9, pp. 122 - 139.
Learner’s Module (LM) in Math 9, pp. 187 – 205.
EASE Module Second Year Variations Modules 1-3 Chapter 4 Variation pp.102-121 (LM)
LRMDS, “Direct Variation”
IV. Procedures
A. Review
Teacher let the students answer problems involving ratio and proportion in a form of a game
Tic-Tac-Toe explaining the mechanics of the game.
B. Establishing a
State the objective for the day.
purpose for the lesson Cite some examples from the previous activity.
C. Presenting Examples Present and discuss proof of basic triangle proportionality theorem as well as converse of
of the new Lesson
triangle proportionality theorems.
D. Discussing new
Present and discuss illustrative examples of problems involving proportionality theorems.
concepts and
practicing new skills
#1
E. Developing Mastery
Have the students answer practice exercises in a form of a mini quiz.
F. Finding practical
Have the students cite example of proportions in other disciplines like science, TLE, MAPEH,
applications of
etc.
concepts and skills in
daily living
G. Making
Have the students complete the statements flashed to summarize the lesson.
Generalizations and
abstractions about the
lesson
H. Evaluating learning
Have the students answer the quiz using quizziz.com to evaluate how much they learned
about the lesson.
Prepared by:
SHIRLEY D. TOTANES
Teacher III
Observed by:
GILBERT A. CHERWEG
Master Teacher I