Circle and its parts lesson plan

1. See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/331439467
A LESSON PLAN ON "Circle and Its Parts or the Terms Related To It"
Method · March 2019
CITATIONS
0
READS
12,571
2 authors, including:
Some of the authors of this publication are also working on these related projects:
k-12 Mathematics Lesson Plan View project
Statistics Education View project
Craig Refugio
Negros Oriental State University
88 PUBLICATIONS 29 CITATIONS
SEE PROFILE
All content following this page was uploaded by Craig Refugio on 01 March 2019.
The user has requested enhancement of the downloaded file.

2. A LESSON PLAN ON “Circle and Its Parts or the Terms Related To It”
Mr. Rolan V. Narciso
Craig N. Refugio, PhD
I. LEARNING OBJECTIVES
At the end of the one-hour period (60-minute period), the student should be able to:
(KNOWLEDGE): 1. identify the parts of a circle
(SKILLS): 2. illustrate a circle and the terms related to it: center, radius, diameter,
chord, secant and tangent
.(ATTITUDE): 3. develop the value of determination in acquiring the skill
II. SUBJECT MATTER
A. Topic: The Circle and Its Parts or the Terms Related To It.
B. Reference: Oronce, Orlando and Mendoza, Marilyn. Work text in Mathematics
(e-math)., Rex Book Store.
Foundation and Application Geometry III by: Gureng Jimenez
GEOMETRY: Plane and Solid by: Brown Montgomery
Schuams-outline-of-geometry-4th-edition 2 pdf.
C. Materials: Visual aids, chalk, blackboard, laptop, and TV set
D. Strategies/Methods Used: Collaborative Learning, Lecture Method, ICT Integration,
Deductive Method
E. Values Integration: Cooperation, enthusiasm, appreciation, determination
III. PROCEDURE
TEACHER’S ACTIVITIES STUDENT’S ACTIVITIES
A.Preparation (5 minutes)
“Good Morning Class...”
“How’s your day my dear students?”
“It’s nice to hear that! Before anything else,
may I request everyone to please stand for a
prayer to be lead by Geniesa.
“Thank you_________. Before you may take
your seats, kindly pick up some pieces of paper
under your armchair and after that, please go
back to your permanent seat because I will
“Good Morning Sir!”
“It’s good Sir.”
(Students follow what their teacher requested
to them)
Geniesa: “Let us all put ourselves in the
presence of the Lord as we say, In the name of
the Father, and of the Son, and of the Holy
Spirit, Amen.
“Our Father…”
(Everyone is praying.)
“Yes Sir.”
(Students go back to their proper seats)

3. check your attendance according to your seat
plan.
Who can recall on what we had discussed last
meeting? Yes, Malou?
What are polygons?
Very good Zyra.
Who can give examples of polygons?
Thank you Sabueto.
Malou: Last meeting we discussed about
polygons.
Zyra: Polygons are plane figure formed by
three or more segments such that each
segments intersects with exactly two others
and no segments with a common endpoint are
collinear
Sabueto: The example of polygons are
Triangles, Quadrilaterals, Pentagon, Hexagon,
Heptagon, Octagon, Nonagon, Decagon and
etc.
B. Motivation (5 minutes)
“This morning we will discuss another lesson
but before we will proceed to our proper
discussion let us have first an activity. I will
divide the class into two teams. This side will
be the Team A and the other side will be the
Team B.
Okay, are you familiar with the game
“BRING ME”?
The instruction is you will bring the objects
that I will ask from you and anyone from the
group who can bring the exact object to me,
each group member will get 5 points each.
You will only be given a maximum of 1
minute to find the particular object.
Are you ready?
Objects to bring:
 Botton
 Coins
 Circular bracelets
 Round strip of paper
 Circular plate
 Cover of Circular food
container or any container
 Water bottle cap
The winner is.....
Thank you for your cooperation class! Let’s
give ourselves a VIVA applause!
“Yes Sir.”
“Okay Sir.”
“Yes Sir!!!”
(Students provide the objects)
(Students do the VIVA applause.)

4. C. Presentation
From the activity that we have done what do
you think is our lesson for today? Anyone?
Yes Rowel?
Brilliant idea, so our topic for today is all about
circles, but we will not just discuss what a
circle is, we will also discuss the terms related
to a circle and its parts.
.
( Rowel is raising his hand)
Student: I think it’s about circles Sir.
D. Discussion Proper (20 minutes)
Let’s discuss first what a circle is. Anyone
who has idea if what a circle is? Yes Shaira?
Okay very good! That is one of the
definitions of a circle.
In other words, a circle is the set of all points
in a plane that are the same distance from a
fixed point called the center.
I have here a circle, what do you see inside
the circle? Yes Sabino?
Okay, there is a point at the center of the circle,
this point is called the center or the central
point. Circles are named through their central
point. So, what is the name of this circle?
Very good!
Next is the radius. What is a radius?
Based on the definition who can draw a
radius in circle A? Okay Cadiz.
Shaira: For me, a circle is a perfectly round
shape.
Sabino: I can see a point located at the center
of the circle.
Students: Circle A Sir.
Students: A radius is a line segment joining
the center and a point on the circle.
 A

5. Very good Cadiz!
If we write B on the other end of the radius
then we have now segment AB as the radius
of circle A.
All radii in a circle have equal length. Radii is
the plural form for radius.
The other part of a circle is diameter. What is
a diameter?
A diameter divides the circle into two equal
parts. Also, the measurement of the diameter
is twice the measurement of the radius and the
central point is the midpoint of the diameter.
Anyone who can draw a diameter in the circle?
Yes Rhea?
If we write C and D at the endpoints of the
diameter then we have segment CD as the
diameter of circle A. Let’s say, the radius of
circle A is 4 cm how long is the diameter of the
circle? Yes Regilyn?
Very good!
The next part of a circle is chord. What is a
chord?
Let’s draw a chord in the circle.
B
C
We have segment CE as an example of a
chord. So, now I have a question, are all
B
Students: Diameter is a line segment that
passes through the center of the circle.
(Students are raising their hands)
B
C
Regilyn: The diameter is 8 cm Sir.
Students: A chord is a line segment whose
endpoints are on a circle.
 A
 A
D
 A
D
E

6. diameters considered as chords and are all
chords considered as diameters? Come think
of it class.
Yes Zydel!
Very well said Zydel!
Let’s proceed to the next term related to a
circle which is a secant. What is a secant?
Anyone who can draw a secant in the circle?
Yes Abijah?
Very Good Abijah. We have line DE as an
example of a secant.
Then, another term related to a circle is
tangent. What is a tangent?
Who can give me the tangent of circle A?
Lydell please.
Very Good Liddell. The point where a
tangent line touches or intersects the circle is
called the point of tangency.
From the illustration, what is the point of
tangency? Yes Dan?
Very Good. So, these are the parts of a circle.
Do you have any questions? Clarifications?
Zydel: Apparently, all diameters are
considered as chords but not all chords are
considered as diameters because not all chords
passes through the center of the circle.
Students: A secant is any line, ray, or segment
that contains a chord. It is a line that
intersects a circle in two points.
B
C
D
Students: It is a line that intersects a circle at
exactly one point.
B
C
D
Dan: Point B sir.
 A
E
 A
E
𝑙

7. Students: None Sir.
F. Drill/Enrichment Activities
(5 minutes)
“To further enhance your knowledge, let’s do
some more examples.”
Please look at the figure in the screen and
read the instructions carefully.
From the illustration, name or identify all
chords, diameter, radii, secant, tangent, point
of tangency and the center of the circle.
B
D
G
G

8. C
(Students participated every time their teacher
asked them.)
Application (10 minutes)
Before we will proceed to our next activity,
can you sight any experience of yours on how
circles are used in our daily lives? Yes
Ashley?
Very good Ashley! Anyone who has another
idea to share?
Very Good class. You really understand our
lesson for this morning.
At this very moment, you are going to apply
what you have learned to real-life situations.
We will have another activity. I’m going to
divide you into four groups. Please count 1 to
4 starting from you Radjian.
Group 1 stay here, Group 2 stay there, Group
3 stay on that side, and Group stay on the other
side. Transfer silently class and don’t
disarrange the chairs.
Are you now in your group class?
I have here a problem: An electronic and
communication engineer designed a circular
disk to be put up in a call center building.
Before he installs the disk, he let his men check
Ashley: For me sir, circle is used in our daily
lives like the different things that we used in
our house like clocks, circular plates, circular
tables and chairs.
(students share their insights )
(The students are counting.)
“Okay sir”
“Yes Sir.”
 A E
F H
I

9. the disk and its parts. Supposed, I am the
engineer and you are my working men, what
are now the parts of the circular disk? Identify
the radius, chord, diameter, secant and tangent
given the figure.
You will be only given 5 minutes to do the
task.
Your time starts now.
Okay time is up. May I call on the
representative of group 1 to please stand and
tell us what you’ve done? The rest of the group
please listen and check your answers.
Very Good. All groups did it correctly. Let’s
give everyone a “YES” applause for a job
well done.
Geneisa: Our Group’s answer is
chords Dia-
meter
radii Secant Tan-
gent
DG HF AH BD BJ
HF AF
(Students do the applause.)
G. Abstraction/Generalization
(3 minutes)
So, who will give now the recap of the things
that we have discussed today?
Excellent Keith! The point where a tangent
line touches or intersects the circle is called
the point of tangency.
So, you know already the parts or the terms
related to a circle?
Are you now ready for a test?
Keith: As a recap, a circle is the set of all points
in a plane that are the same distance from a
fixed point called the center. The parts of a
circle are center or central point, radius,
diameter, chord, secant and tangent.
Students: Yes, Sir.
Students: Yes, Sir.

10. IV. ASSESSMENT (10 minutes)
On a 1/4 piece of paper, draw a circle with a center B, with two diameters namely,
segments AC, and DF, whose chords are AC, DF, CF, and DG, a secant HI, and tangent
JK intersecting A. (By pair)
V. ASSIGNMENT (2 minutes)
Study in advance about central angle, inscribed angle, and arcs of a circle.
View publication stats
View publication stats