# Shapes that are congruent

From Karnataka Open Educational Resources

Shapes can be combined together to form congruent shapes. Identifying such shapes for congruence is explored in this activity.

### Objectives

To understand how the shapes are congruent

### Estimated Time

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

Prior knowledge of point, lines, angles, parallel lines, closed figure

### Materials/ Resources needed

- Digital : Computer, geogebra application, projector.
- Non digital : Worksheet and pencil,6-8 strings (preferably in different colors)
- Image files :

### Process (How to do the activity)

Use image files - “5. F-pentomino_Symmetry.svg”,“6. L-pentomino_Symmetry.svg”, “7. Congruence class image7.png”

- Are the things in the picture same?
- Which among them are same? Children can point out shapes that are same
- How can you say they are same?
- An example of how palms are same can be discussed, how can you place your palms to say that they are same
- HW. Make figures from sets of 5 squares: Cut out 5 squares of 1cm each with a newspaper. Try to make different shape with the 5 squares.How many different shapes are possible? (Stick in you note books any one of the combinations)

Use image file - “8.Congruence class image8.png”

- Name all the shapes in the picture.
- Point out figures that are of same shape.
- What about their size?
- Find figures that are exactly same.
- What do you call two things that are exactly same. What are the parameters that are required for two things to be exactly same(shape and size)?
- Establish concept of congruence and define the concept

**Evaluation at the end of the activity**

- Students should be able to define congruence and identify shapes that are congruent