MATH 4_Q1_WEEK1-Illustrate different angles (right, acute, and obtuse) using models.

Learning
Competencies
The learners will be
able to:
1. Illustrate different
angles (right, acute,
and obtuse) using
models.
2. Measure and draw
angles using a
protractor.

Learning
Objectives
At the end of the lesson
the learners will be
able to:
1. Identify and
differentiate right
angles from other types
of angles.
2. Define a right angle
as a 90-degree angle.

Understanding
Right Angles
DAY 1

Real-life Examples Of Right
Angles

“RIGHT ANGLE HUNT"
Find objects
around the classroom
that have right
angles and explain
why those angles are
right angles.

HANDS-ON ACTIVITIES:
Create your own
objects with right
angles.
For example, you can
design and build a
small bookshelf using
cardboard and identify
the right angles you've

REAL-LIFE EXAMPLES:
Find real-life
examples of right
angles.
Identify the "L"
shape and explain why
it's a right angle.

DISCUSSION:
Why right angles are
important in everyday
life, architecture, and
navigation?

REVIEW:
• What do we call the space
between two lines that
meet?
• How do we measure angles?
• What's the unit we use?
• If two lines are at a
90degree angle, what term
do we use?

REVIEW:
• Can you think of an object
around you that has right
angles? What is it?
• How many degrees are in a
right angle?
• When you make an 'L' shape
with your fingers, are
they perpendicular?
• Can you give an example of
an angle you might see at

REVIEW:
• What shape has four right
angles? Can you draw it?
• If you fold a piece of
paper and create a corner,
what have you made?
• When you cross two pencils
to form a 'T' shape, what
do we call the way they
meet?

- At 9:00, the minute and hour hands of the
clock form an angle which measures 90˚.
- This angle, like all angles which measure
90˚, is called a right angle.
RIGHT ANGLES

- An angle that forms a square corner is a right angle.
- A right angle measures 90.
- Angle PIA is a right angle.

Form your bodies into a right angle
by bending their arms at the elbow to
create an "L" shape.

•Create your own right
angles by joining two
pieces together.
HANDS-ON CONSTRUCTION:
Work In Pairs Or Small
Groups
Materials
:
like
straws
cardboard
craft
sticks

Construction Of A
Right Angle Using A
Protractor.

• Summarize the
characteristics of right
angles in your own words.
GENERALIZATIONS
AND ABSTRACTIONS

• Find and photograph real-
world right angles in the
environment.
ASSIGNMENT:

Learning
Objectives
able to:
1. Define and recognize
acute angles.
2. Identify acute angles
in different contexts.

Angles are measures of
how much one direction
deviates from another. In
simpler terms, they help us
understand how much something
is turned or tilted. Small
angles are angles that are
not very wide or open. They
are often less than 45
degrees.

Have you ever looked
at a clock and noticed
the long and short
hands pointing at
different numbers?

Those hands create
small angles to show us
the time! Small angles are
like tiny turns or tilts.

Imagine you have a pencil on
your table. It's not standing
straight up, and it's not lying
flat either – it's at a little
angle. That's a small angle!
We see small angles in lots
of everyday things, like
stairs, swings, and even when
we walk up a hill. These small
angles help us tell time, move
around, and even build strong
and cool things.
So, small angles might be
small, but they're super

ACUTE ANGLE HUNT
Your mission is to
find triangles that
have angles smaller
than a corner but
bigger than a flat
line.

CREATIVE CORNER:
Draw your own
triangles and color
in the acute angles.

REVIEW:
• What is an acute angle?
• How many degrees are in a
right angle?

"ACUTE ANGLE SEARCH"
Look for real-
life examples of
acute angles around
the classroom. When
you find an example,
you can draw and
label it.

- At 2:00, the minute and hour hands of
the clock form an angle which measures
60˚.
- This is between 0˚ and 90˚ The angle
here, like all other angles which
measure between 0˚ and 90˚, is called
an acute angle.

- An angle less than a right angle is an acute angle.
- An acute angle measures less than 90 degree.
- Angle SEB is an acute angle.

"ACUTE ANGLE HUNT"
Sort the cards and
identify which ones
are acute angles
(less than 90
degrees).

How acute angles can be
measured with a protractor?

• Why acute angles
are important in
geometry and real-
world applications?
GENERALIZATIONS
AND ABSTRACTIONS

Categorize the pictures whether
it is an
acute or not.

• Create your own
set of acute angle
flashcards for
review.
ASSIGNMENT:

Learning
Objectives
able to:
1. Define and
distinguish obtuse
angles from other types
of angles.
2. Identify and measure
obtuse angles
accurately.

Investigating
Obtuse
Angles
DAY 3

• Obtuse angles are angles
that measure more than
90 degrees but less than
180 degrees.
Introduction to Obtuse
Angles:

Real-life Examples Of
Obtuse Angles

Hands-On Activities:
Create their own
obtuse angles using
paper, protractors, or
even their own bodies.

Real-World Scavenger Hunt:
Identify objects or
shapes
around you that have
obtuse angles.

- At 5:00, the minute and hour hands of the
clock form an angle which measures 150˚.
This is between 90˚ and 180˚ The angle here,
like all other angles which measure between
90˚ and 180˚, is called an obtuse angle.

- An angle greater than a right angle is an obtuse
angle.
- An obtuse angle measures more than 90 but
less than 180.
- Angle AGL is an obtuse angle.

Angle Art:
Draw your own obtuse
angle, making it as wide
as you can. Imagine your
obtuse angle is a slice
of something yummy!

Measuring an Obtuse Angle:
• Draw an obtuse angle on
the screen and place the
protractor's center at
the vertex (corner) of
the angle.
• Align the baseline of the
protractor with one side
of the angle.
• The protractor will show
the measurement of the

Drawing an Obtuse Angle:
• Draw your own obtuse
angles.
• Use the interactive
protractor to measure and
draw the angle.

Characteristics of the different
angles:
• Acute angles are smaller
than 90 degrees.
• Right angles are exactly
90 degrees.
• Obtuse angles are larger
than 90 degrees.

Sorting Activity:
a. Distribute the angle
cards randomly among the
learners or groups.
b. Look at each angle,
measure its degree using a
protractor, and then decide
which category it belongs
to: acute, right, or
obtuse.
c. Place the angle cards on

• Give real-world
situations where
obtuse angles are
encountered.
GENERALIZATIONS
AND ABSTRACTIONS

• Create a visual
poster displaying
different types of
angles and their
properties.
ACTIVITY:

Learning
Objectives
At the end of the lesson the
learners will be able to:
1. Define what an angle is
and its components.
2. Identify and
differentiate between acute,
obtuse, and right angles.
3. Explain the concept of a
protractor and its use in
measuring angles.

Introduction to
angles and their
characteristics.
DAY 4

• What do you
know about
geometric shapes
and angles?

Show-and-Tell Activity:
• Identify the shape or shapes
you see in the picture.
• Describe the shapes and
count the sides and corners.

• Can you find something
around the classroom or at
home that has a similar
shape?

• Identify where you can see
the right, acute, and obtuse
angles in the following
pictures.

Real-Life Angle Hunt: Small
groups
• List of objects or scenarios to
find and measure angles: doors,
windows, corners of tables,
books and blackboard
• Find and measure a right angle
(90 degrees).
• Find and measure an acute angle
(less than 90 degrees).
• Find and measure an obtuse angle
(more than 90 degrees).
Share their findings and
describe where they found each
type of angle.

Term Introduction:
• Angle: A shape formed when
two lines meet or cross each
other.
• Vertex: The point where the
two lines meet in an angle.
• Arms: The two lines that
form an angle.

• Acute Angle: An angle
that is smaller than a
right angle (less than 90
degrees).
• Obtuse Angle: An angle
that is larger than a
right angle but smaller
than a straight angle
(between 90 and 180

• Right Angle: An angle
that looks like the corner
of a square and measures
90 degrees.
• Protractor: A tool we use
to measure angles in
degrees.

Three Main Types Of Angles:
• Acute Angle:
An acute angle
is smaller than
a right angle.
It's like a
"tiny“ angle.

• Right Angle:
Right angle is
exactly 90
degrees.
It looks like
the corner of a
book or a
square.

• Obtuse Angle:
An obtuse angle is wider than a
right angle.
Examples like an open book or a
clock at a specific time.

How To Identify And Classify Angles
Based On Their Measurements?

• Summarize the key
concepts about
angles and
protractors.
Generalizations
And Abstractions

Learning
Objectives
able to:
1. Measure angles
accurately using a
protractor.
2. Draw angles of
specific degrees using a
protractor.

Measuring and
Drawing
Angles with a
Protractor
DAY 5

Strategy for Precise
Angle Measurement:
1. Steady Protractor:
Put your protractor on a flat
and stable surface, like a
table or a desk. This helps to
keep it steady while you
measure.
2. Center Match:
Make sure the middle dot of
the protractor (that's the
center) fits right on the

3. Side Line-Up:
Put one side of the angle
right along the straight line
at the bottom of the
protractor. This is the
starting point for
measuring.
4. Read Carefully:
Look where the other side of
the angle crosses the
protractor's circle. Read the
number right where it touches.

5. Inner or Outer Numbers:
If your angle is smaller than
a corner (90 degrees), use the
numbers inside the circle. If
it's bigger, use the numbers
outside.

1. Imagine you have a
protractor. One of its sides
is labeled "0 degrees" and the
other side is labeled "180
degrees." If you measure an
angle and the second side
crosses the "90 degrees" mark
on the protractor, what type
of angle is it? Write the
answer.
Answer the following
questions:

2. Pretend you're explaining
angles and
protractors to a friend who
doesn't know about them. Use
the word "measure" and
"degrees" in your explanation.
For example: "We use a
protractor to measure angles.
The degrees tell us how big
the angle is."

What type of angle is it?
Is it acute, right, obtuse, or
straight?
Problem 1: Identifying
Angle Types
Look at the angle below.

Problem 2: Measuring an Acute
Angle Using a protractor,
measure the size of the angle
marked by the vertex letter
"D."

Problem 3: Comparing Angles
Compare the two angles below.
Which angle is bigger, the one
marked by "E" or the one marked by
"F"?

Draw These Angles On Your Own:
Degree Measurements
(30°, 90°, 120°)

a. How did you find drawing
angles using a
protractor?
b. Why is it important to
follow the steps accurately
when using a protractor?
c. Can you think of real-life
situations where precise angle
measurement is crucial?
Answer the following
questions:

• Summarize the steps
for measuring and
drawing angles with
protractors.
Generalizations
And Abstractions

Scenario 1: Building a Ramp
Problem: Imagine you're
designing a ramp for a
skateboard park. The ramp
needs to have an incline that
is not too steep. You want the
incline to be 30 degrees. Draw
an angle of 30 degrees that
represents the incline of the
ramp.
Work in pairs to solve these
problems.

MATH 4_Q1_WEEK1-Illustrate different angles (right, acute, and obtuse) using models.

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