SCHOOL
GRADE 1 to 12
DAILY LESSON
PLAN
TEACHER
SUBJECT
Cristina B. Gonzales
Memorial High School
BONIE C. SANCHEZ
Grade
Level
Quart
er
11
4th
DATE
DAY
2
MATHEMATICS 9
WEEK
I. Objectives
At the end of the lesson, the students should be able to:
 Define and illustrate law of sines
(M9GE-IVf-g-1)
 Solve and find the missing measurement of an oblique
triangle using law of sines
 Apply law of sines in real – life situations
Content Standards
The learner demonstrates understanding of the basic concepts
of trigonometry
Performance Standards
The learner is able apply the concepts of trigonometric ratios to
formulate and solve real – life problems with precision and
accuracy
Illustrates law of sines (M9GE-IVf-g-1)
Learning Competencies/Objectives
(Write the LC code for each)
II. Content
LAW OF SINES AND ITS APPLICATION
III. Learning Resources
References
Learning Module for Junior High School Mathematics Grade 9
Quarter 4
IV. Procedures
A. Reviewing previous lesson or
presenting the new lesson
B. Establishing a purpose for the
lesson
(ENGAGE)
 Opening Prayer and greetings
 Review on Solving Right Triangles and trigonometric
ratios
Activity #1 : SORT ME OUT
ANNOTATION:
The teacher will
present
different
triangles
with
corresponding
measurement. This
will help students
the
skills
of
classifying
that
allows
them
to
choose and select
the best way to use
1. Which of the following triangles that in solving triangles.
can be solved using trigonometric
After the activity,
ratios?
teacher
will
2. What do we call triangles that does the
present the topic
not have a right triangle?
and the objectives of
OBLIQUE TRIANGLE
the lesson
- Is a triangle which does not
contain a right triangle
RIGHT
TRIANGLE
ACUTE
TRIANGLE
OBTUSE
TRIANGLE
3. How then do we solve oblique
triangles?
C. Presenting examples/ instances
of the new lesson
(EXPLORE)
Activity #2: WHAT IS MY CASE?
CASE 1
AAS
CASE 2
ASA
CASE 3
SSA
Questions:
1. What have you noticed about
each of the given triangles?
2. Can you use trigonometric ratios
to solve for the missing parts of
theses tringles?
3. How do we solve these triangles
given the different cases?
D. Discussing new concepts and
practicing new
E. skills #1
(EXPLAIN)
ANNOTATION:
The teacher will use
answers from
activity #1 as
example to present
the lesson.
Let the students
pick one triangle
with corresponding
given parts in the
previous activity
and paste it on box
whether the
triangle belongs to
AAS, ASA, SSA.
This will lead to
proper discussion of
the lesson
LAW OF SINE
SINE LAW states that in any triangle ABC, the
sides are proportional to sines of the opposite
angle.
Example 1. Given two angles and one side (AAS)
Example 2: given two sides and an angle opposite one of them
(SSA)
.
E. Developing mastery (Leads to
formative assessment)
Activity: IT’S YOUR TURN
ANNOTATION
Solve fort the missing
measurement of each triangle.
Let the students solve the
missing measurement of the
given triangle. After solving
the unknown measurement,
allow students to present
their work on the board and
allow them to explain the
process in solving using the
sine law.
1.
2.
The teacher will assist and
check the work of the
students
F. Finding practical/ applications of
concepts and skills in daily living
ANNOTATION:
INTEGRATION: The teacher
will
integrate
the
importance of the lesson in
real – life situations such as
measuring
farm
land,
residential lot especially in
the field of carpentry.
The teacher will present
different
examples/applications that
involves solving triangles
using Sine Law in real life
problems.
G. Making generalization and
abstractions about the lesson
J. Evaluating Learning
K. Additional activities for
application or remediation
V. Remarks
VI. Reflection
A. No. of learners who earned
80% on this formative
assessment
The teacher will group the
class into two (2) groups. Let
them
solve
real-life
situations involving Sine
Law. This is in the form of a
game. A group who finish
the task first will be
announced as winner and it
will be given a reward.
Allow each group to present
their work on the board.
 What is the Law of ANNOTATION
Sines?
The teacher will let the
 In what case or situation students to summarize the
can we use the law of lesson.
sines
Find the value of the missing sides and angle of the given triangle
using the law of sines
B. No. learners who require
additional activities for
remediation
C. Did the remedial lessons
work?
No. of learners who have
caught up the lesson
D. No. of learners who
continue to require
remediation
E. Which of my teaching
strategies worked well?
Why did these work?
F. What difficulties did I
encounter which my
principal or supervisor help
me solve?
G. What innovation or localized
materials did I
used/discover which I wish
to share with other teacher?
Prepared by:
BONIE C. SANCHEZ
Subject Teacher