This lesson plan is for a 9th grade mathematics class on the Pythagorean theorem. The objectives are for students to identify the parts of a right triangle and solve for unknown sides using the theorem. The teacher will present the theorem using pictures and examples on an overhead projector. Students will practice solving problems identifying missing legs and hypotenuses of right triangles. They will then complete practice problems independently for homework.

1. A Detailed Lesson Plan in Mathematics
Grade 9
I. OBJECTIVES
a. demonstrate their ability to locate the legs, and the hypotenuse on a right
triangle.
b. Give their own little ways of how to be naturalist.
c. . solve for the unknown parts of a right triangle using Pythagorean Theorem
II. SUBJECT MATTER
A. Topic: Pythagorean Theorem
B. Reference: Mathematics for the new Millennium (Maxima J. Acejalado, Lolita B.
Bundalian, Olivia N. Buzon)
C. Materials:
- pictures (triangle)
- Calculators
- protractor
- Over head projector or white board to write important
- formulas and examples for the students to understand.
D. Value: Naturalist
II. LEARNING ACTIVITIES
Teacher’s Activities Pupils’ Activities
A. Preliminary Activities
1. REVIEW
Ok class let’s review our lesson yesterday
What is right triangle again, what is it class?
give one and draw it on the board
Ok Jeck
Acute triangle (the student draw an
example of an acute triangle.

2. What kind of triangle is this?
Now let us move on to the third types of a
triangle.
The right triangle
Do you have an idea about a right triangle?
Have you heard it before?
( POWER POINT PRESENTATION &
DISCUSSION )
2. MOTIVATION
Now, let’s have a game called “ARRANGE
yourselves”
I will divide the class into four groups. Each
group will have three representatives. You are
going to arrange yourself according to what I
am going to say.
Are you ready?
Arrange yourselves according to:
a. Your height
b. The length of your hair
c. Birth Month
d. Size of your foot
After each item, the teacher will emphasize the
difference of their sizes and length.
The group with the greatest earned points will
win.
B. PRESENTATION
1. Find the length of one leg of the
figure below.
Obtuse triangle
Not yet Ma’am
That is a scalene triangle
No sides are equal

3. a = ? , b = 16 , c = 20
Since one leg is missing we have to ,
Manipulate/modify the formula in order
to find the missing part.
So we have that formula
a2
= c2
+ b2
B. EVALUATION
Solve for the unknown parts of the Triangle.
Enclose your final answer.
1.)
a =?
b = 3
c = 15
2.) a = 6
b = 8
c =?
III. ASSIGNMENT

4. Answer your Test yourself in your Math book pages 216 – 218
Nos. 1-4 in your assignment notebook. Enclose your final answer.