Shapes that are congruent

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


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

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