# Parts of an Angle I. Learning Objectives Cognitive Identify parts

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```							Parts of an Angle

I. Learning Objectives

Cognitive:            Identify parts of an angle
Psychomotor:          Draw an angle showing its parts
Affective:            Participate actively in-group work

II. Learning Content

Skills:               1. Identifying the parts of an angle
2. Drawing angles
References:           BEC-PELC III.A.2, 2.1
textbooks in Math 4
Materials:            drawing and cut outs of angles
Value:                Cooperation

Ill. Learning Experiences

A. Preparatory Activities

1. Drill

Identify the following lines:

2. Review

What is a ray?
Name the rays in the illustration.

3. Motivation

What do you think will be formed when the endpoint of the two rays meet?

B. Developmental Activities

1. Presentation
a. Ask a pupil to draw a point on the board and name this point O.
b. Ask another pupil to draw a ray with 0 as the end point and name this ray OR.
c. Ask another pupil to draw another ray using 0 as the common end point and name this
ray OZ. Their drawing may look like this:
d. Introduce the term vertex.
The common endpoint of ray OR and OZ is called vertex.
The rays are called the sides.
What figure have you formed? (angle)
What angle have you formed?         ZOR or    ROZ
The vertex is always named by the middle letter.
What are the parts of an angle?

2. Group Work
(Remind the pupils the importance of participating actively in all the activities)
Give the vertex and the 2 sides of the angles below.

3. Fixing Skills

a. Identify the parts of each angle.

b. Draw an angle, label its parts.

4. Generalization

What are the parts of an angle? The parts of an angle are the vertex and the sides.
What is the vertex? The common endpoint of two rays is called the vertex.

C. Application
Name the angles that can be found in the illustration. How many angles can be formed? Identify
the sides of each angle.
IV. Evaluation

A. Give the endpoint and the two sides of each angle below.

B. Can you find the angles in the figure below? Name the angles formed and the parts of each
angle.

C. Draw 5 angles. Name the angles and label its parts.

V. Assignment
Name as many angles as you can in the figure below.
What is the vertex of all the angles'?
Name 5 sides of any angle.

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