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Use only triangles - Mathematics

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Use only triangles

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Shapes and Designs
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Chapter 5: Shapes and Designs - The 7–piece tangram [Page 68]

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NCERT Math - Magic [English] Class 3
Chapter 5 Shapes and Designs
The 7–piece tangram | Q i) | Page 68

RELATED QUESTIONS

Colour the clown following the directions given below :

Triangles

Squares

Rectangles

Circles  


Look around you and identify things with straight and curved edges.


  1. Take a rectangular sheet of paper.
  2. Count its corners.
  3. Now fold one of its corners.
    a) How many corners does it have now?
    b) How many corners will you get by folding
    i) 2 corners
    ii) 3 corners
    iii) 4 corners
    c) Can you fold this paper in such a way that it has only three corners? You are allowed only two folds.
    What shape will you get?
  4. Repeat the activity with a square sheet of paper.
  5. Can you fold all the corners of the square sheet in such a way that the number of corners remains unchanged?

Look at the following table and tick (√) the names of things that have  corners. Also count the number of edges and corners in ea.ch of them.

Name of thing Whether it has corners Number of edges Number of corners
Die Yes   8
Ball      
Eraser      
Egg      
Sheet of paper      

In the following figures, tick (√) those which have corners. 

Do these figures have curved lines?


Use pieces 1, 2, 3, 4 and 5


Is any shape repeating in a particular pattern? Which ones?


You can also make your own tiles and use them to make your own tiling patterns. You will find some such tiles at the end of the book that you can cut out, trace and colour.


Complete this pattern. Compare it with the pattern on page 70 which also uses six sided shapes. What is the difference between the two?


Franke and Juhi's mummy has hidden a surprise gift for both of them. But she wants them to find out through a treasure hunt. She has written some instructions here. Can you help Juhi and Franke in finding their gift?

  1. Start from the tallest tree.
  2. Go forward on the pathway.
  3. From the sixth tile, turn left.
  4. After moving a few steps again you will find a plant on your right hand side.
  5. Colour the dress of the child playing closest to this plant.
  6. Start moving again from the plant.
  7. On the fourth tile, turn left again.
  8. On the way, you will find the corner of the fourth tile is broken.
  9. You will find a bat and a ball lying on the ground. Don't pick them up, just circle them.
  10. Move ahead and turn right.
  11. You will find a mango tree. A few mangoes can be seen on the tree. Colour 11 mangoes on the tree.
  12. Also draw some grass near the mango tree and start moving again on the pathway.
  13. When you go straight, you will find a house. 
  14. Behind that house there is a bag. Open it and you will find something sweet in it! Can you tell what their mother has kept in the bag?


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