Shapes that are congruent

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

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 :
  1. “F-pentomino_Symmetry.svg”
  2. “L-pentomino_Symmetry.svg”
  3. “Congruence class image7.png”
  4. “Congruence class image8.png”

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