# Congruent circles

Equal circles are circles with same radius is a concepts that is introduced in this activity.

### Objectives

1. The students learn that congruent circles are the circles that have same radius but different centres.
2. Congruent circles can also be called as equal circles.

### Estimated Time

3 minutes for video and 30 minutes to actually cut.

### Prerequisites/Instructions, prior preparations, if any

The students should know what are congruent circles.

### Materials/ Resources needed

1. DIgital: Laptop, video link.
2. Non digital: Cardboard, a stick, nails, scale, pencil.
3. Video :

### Process (How to do the activity)

1. Ask the students to watch the youtube clip
2. Was the compass used here?
3. What types of circles did he cut?
4. What type of stick can be used ? (straight)
5. How many nails are fixed to the stick and for what purpose ?
6. What does the fixed nail depict ?
7. What is the trace made by moving line called ?
• Evaluation
1. Were the students able to conclude that there are alternatives for compass?
2. Can you suggest some more methods of getting a circle?
1. Find out which methods are used while drawing circles in rangoli designs ?