# Congruent circles

From Karnataka Open Educational Resources

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

### Objectives

- The students learn that congruent circles are the circles that have same radius but different centres.
- 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

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

### Process (How to do the activity)

- Ask the students to watch the youtube clip
- Was the compass used here?
- What types of circles did he cut?
- What type of stick can be used ? (straight)
- How many nails are fixed to the stick and for what purpose ?
- What does the fixed nail depict ?
- What is the trace made by moving line called ?

- Evaluation

- Were the students able to conclude that there are alternatives for compass?
- Can you suggest some more methods of getting a circle?

- Find out which methods are used while drawing circles in rangoli designs ?