# how to make working model to demonstrate the parts of a circle

To familiarize learners with the basic components and terminology associated with circles, including the center, radius, diameter, circumference, arc, sector, chord, and tangent.

Creating a working model to demonstrate the parts of a circle for a mathematics teaching and learning material (TLM) is a great way to help students understand the components of a circle.

Here’s a simple yet effective way to make it:

### Materials Needed:

1. Cardboard or foam board
2. Compass
3. Protractor
4. Ruler
5. Scissors
6. Colored paper or paint
7. Marker
8. Pushpin
9. String or yarn
10. Thumbtack
11. Glue

### Steps by Step Video Instructions on parts of circle :

#### 1. Prepare the Base:

• Take a piece of cardboard or foam board as the base for your model.
• Cut it into a large circle to represent the circle itself.

#### 2. Divide the Circle:

• Using a protractor, mark the center of the circle.
• With the compass, draw a large circle to represent the circumference of the circle.
• Draw diameters, radii, and chords within the circle, originating from the center.
• Label each part accordingly using markers.

#### 3. Create a Sector:

• Cut out a sector from colored paper or cardboard.
• This will represent a portion of the circle enclosed by two radii and an arc.
• Label the parts of the sector: radius, arc, central angle, and area.

#### 4. Make a Segment:

• Cut out a segment from colored paper or cardboard.
• This will represent a portion of the circle enclosed by a chord and an arc.
• Label the parts of the segment: chord, arc, and area.

#### 5. Form a Sector and Segment with String:

• Tie one end of a string to a thumbtack and push the tack into the center of the circle.
• Attach the other end of the string to a pencil or marker.
• Stretch the string to the circumference of the circle and draw an arc.
• This forms a sector.
• Repeat the process for another length of string to form a segment.

#### 6. Attach Parts to the Base:

• Glue the colored paper sector and segment onto the base.
• Ensure they are placed correctly according to their labels.

#### 7. Label and Explain:

• Label each part of the model: center, circumference, radius, diameter, chord, arc, sector, and segment.
• Write brief explanations of each part next to them.

#### 8. Demonstrate:

• Use the model to demonstrate the properties of each part of the circle.
• Show how the radius, diameter, chord, arc, sector, and segment are related.

### Explanation:

• The model represents a circle and its various parts: center, circumference, radius, diameter, chord, arc, sector, and segment.
• By using colored paper, string, and labels, each part is visually distinct and identifiable.
• The model can be used to teach students about the properties and measurements of different parts of a circle.

This working model effectively demonstrates the parts of a circle and can be a valuable tool in teaching geometry concepts.