A Detailed Lesson Plan in Math 5
I.
Objective:
At the end of the period, the pupils should
be able to:
A. Identify kinds of
triangles;
B. Measure sides and
angles of a triangle; and
C. Display
cooperativeness during group activity
II.
Learning
Content:
A. Topic: Kinds of Triangles
A.
Reference: Gatbagan, Erlinda E. et al. Maths for Meaningful Lives. Book crafts
Publishiing Co. IncMotiva. 2003. Pg. 261-265
B. Materials: cut-outs
of triangles, ruler, protractor
C. Values:
cooperativeness
III.
Learning
Experiences:
Teacher’s
Activity
|
Learner’s
Activity
|
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A.
Preparatory Activities
1.
Drill
Identify the geometric figures on the
illustrations.
1.
a.
Line
b.
Line segment
c.
Ray
d.
Angle
2.
a.
Line
b.
Line segment
c.
Angle
d.
Point
3.
a.
Perpendicular lines
b.
Line segment
c.
Point
d.
Ray
4.
a.
Intersecting lines
b.
Perpendicular lines
c.
Parallel lines
d.
Rays
5.
a.
Point
b.
Line
c.
Ray
d.
Line segment
Study the figure below.
·
Name all the points
·
Name all the lines
·
Name some line segments
2.
Review
Classify the angles using the table below.
(insert figures of different angles)
 
B.
Developmental Activities
1.
Motivation
“Triangle Hunt”
I have a friend named Mr. T. He is looking
for his relatives. Will you help him find his relatives in the amusement park?
His relatives has the same shape as his.
What is his shape?
What does a triangle look like?
How many sides/angles do triangles have?
Can you find Mr. T’s relatives?
What can you say about the
sizes/measurements of the triangles posted on the board?
Then, it only means there are different
kinds of triangles
2.
Presentation and Discussion of the Lesson.
a.
Triangles according to sides
I have here 3 straws.
Will you measure these straws?
Connect it to form a triangle.
Now. What can you say about the sides of
this triangle?
Triangles like this one are called
equilateral triangle.
Based from the example, what is equilateral
triangle?
I have here 3 straws again (2 straws have
equal length)
Will you measure these straws?
Connect it to form a triangle.
What can you say about this triangle?
Triangles like this one is called isosceles
triangle.
Based from the example, what is isosceles
triangle?
I have here another set of straw (with
different lengths)
Will you measure it?
Connect it to form a triangle.
What can you say about the sides of this
triangle?
Triangles like this are called scalene
triangle.
What are scalene triangles?
b.
Triangles according to angle.
(The teacher will give triangles to the
class)
Measure accurately the angle of your triangles.
Write down the measurements of the angles
so that you won’t forget it.
Who holds triangle with an obtuse angle?
This triangle is called obtuse angle.
Based on its angle, what are obtuse
triangle?
Who holds triangle with a right angle?
This triangle is called right triangle.
What are right triangles?
Who holds triangles with all angles acute?
This triangles are called acute triangle.
What are acute triangles?
3.
Fixing Skills
Identifythe tringles according to their
sides.
1.
2.
3.
4.
5.
6.
4.
Generalization
What are the kinds of triangles according
to their sides? What are they?
What are the kinds of triangles according
to their angles?
5.
Application
For groups 1 and 2:
Draw the following:
1.
Equilateral
triangle
2.
Isosceles triangle
3.
Scalene triangle
4.
Acute triangle
5.
Right triangle
6.
Obtuse triangle
For groups 3 and 4:
Identify the following.
___1. This triangle has 3 equal sides.
___2. This triangle has two equal sides.
___3. This triangle has no equal sides
___4. This is a triangle with all angles
acute.
___5. This is a triangle with right angle.
___6. This triangle has obtuse angle.
For groups 5 and 6:
Identify the illustrations of triangles.
|
d.angle
d.point
d.ray
a.parallel
lines
b.line
Points
: A,B,C,D,E,F,G,H,I
Lines:
EF, BG, ID
Line
segments: HC, CE, EH
Yes, we will.
Triangle
It
has 3 sides and 3 angles
Yes
we can.
They
are different in size and measurements
They
have the same length
Equilateral
Triangles are triangles with equal sides.
Two
of this has equal length
Isosceles
are triangles with 2 equal sides
Scalene
are triangles with no equal sides
Obtuse
triangles are triangles with an obtuse angle.
They
are triangles with right angle.
They
are triangles with acute angle.
1.
equilateral triangle
2.
isosceles triangle
3.
scalene triangle
4.obtuse
triangle
5.right
triangle
6.acute
triangle
The
kinds of triangles according to each sides are scalene, equilateral and
isosceles.
Scalene
has no equal sides.
Isosceles
has two equal sides
Equilateral
has equal sides
The kinds of triangles according to its angles are acute, right and obtuse triangles.
Acute
has 3 acute angles
Right
has one right angles
Obtuse
has one obtuse angle
1.equilateral
triangle
2.isosceles
triangle
3.scalene
triangle
4.
acute triangle
5.right
triangle
6.obtuse
triangle
1.equilateral
triangle
2.isosceles
triangle
3.scalene
triangle
4.acute
triangle
5.right
triangle
6.obtuse
triangle
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IV.
Evaluation:
Choose the letter of the correct answer.
1.
What
kind of triangle has three equal sides?
a.
Isosceles
b.
Scalene
c.
Equilateral
d.
Right
2.
Triangle
with one obtuse angle is called __________.
a.
Obtuse
triangle
b.
Right
triangle
c.
Equilateral
triangle
d.
Right
triangle
3.
What
kind of triangle is shown?
a.
Right triangle
Right triangle
b.
Obtuse
triangle
c.
Acute
triangle
d.
Scalene
triangle
4.
It
is a triangle with no equal sides.
a. Acute triangle
b. Scalene triangle
c. Isosceles triangle
d. Right triangle
5.
What
do you call a triangle with an obtuse angle?
a. Right triangle
b. Obtuse triangle
c. Equilateral triangle
d. Acute triangle
V.
Assignment:
Draw the following on bond paper.
1.
Isosceles
right triangle
2.
Isosceles
obtuse triangle
3.
Scalene
right triangle
4.
Scalene
acute triangle
Prepared by Alma V. Reynaldo, Student Teacher)
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