NCERT: Math-Magic Solutions for Class-3, Chapter-5: Shapes and Designs

Question 1 : Colour the clown following the directions given below:

Answer : Following is the picture of the clown after coloring the shapes in it as per the instructions.

Question 2 : How many triangles are there in the following figures?

Answer :

Question 3 : Find the biggest rectangle in the figures given below.

Answer : In this figure, the biggest rectangle is marked pink in colour.

Question 4 : Meeta and her 5 friends were playing a game. Tinku was blindfolded and asked to keep clapping as long as he wished while the others would move round a table. The moment Tinku stopped clapping, everybody would stop wherever they were. The child who was not at a corner would be out. Then she/he would be blindfolded.
a) Looking at the picture given above, can you tell who is out?
b) Where is Guddu standing?
c) Can this game be played around a round table? Why?

Answer :
a) By the game rules, the child who was not at a corner would be out. In the picture, Guddu is not standing near the corner. So, Guddu is out.
b) Guddu is standing near the edge of the table.
c) Since there is no corner in a round table, this game cannot be played around a round table.

Question 5 :
a) Look around you and identify things with straight and curved edges.
b) Do the things with straight edges have corners?
c) Do the things with curved edges have corners?
d) Try to find things which have both straight and curved edges.

Answer : Observe your surroundings and answer this question. Answers may vary.
a) Following are few examples of things with straight edges. Table, tv screen, diary, etc. Following are few examples of things with curved edges. Plates, wall clocks, tennis balls, etc.
b) Yes, the things with straight edges have corners.
c) No, the things with curved edges don’t have any corners.
d) Following are few examples of things with both straight and curved edges. Car, spoon, guitar, etc.

Question 6 :
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?

Answer : Do the activity as instructed and answer the questions.
a) A rectangular sheet has 4 corners. If one corner is folded then the number of corners will be 5.

b) (i) A rectangular sheet has 4 corners. If two corner are folded then the number of corners will be 6.
(ii) A rectangular sheet has 4 corners. If 3 corner are folded then the number of corners will be 7.
(iii) A rectangular sheet has 4 corners. If 4 corner are folded then the number of a corner will be 8.
c) No, a rectangular sheet cannot be folded in such a way that it has three corners.

Question 7 : Repeat the activity with a square sheet of paper.

Answer : Do it by yourself.
(i) A square sheet has 4 corners. If 2 corners are folded then the number of corners will be 6.
(ii)A square sheet has 4 corners. If 3 corners are folded then the number of corners will be 7.
(iii) A square sheet has 4 corners. If 4 corners are folded then the number of a corner will be 8.
iv) Yes. a square sheet can be folded in such a way that it has 3 corners. It would look like a triangle.

Question 8 : Can you fold all the corners of the square sheet in such a way that the number of corners remains unchanged?

Answer : Yes, the corner of the square sheet can be folded in such a way that the number of corners remain unchanged.

Question 9 : Look at the following table and tick ( ) the names of things that have corners. Also, count the number of edges and corners in each of them.

Answer : Observe the given things and fill up the table. The correct answer is:

Question 10: In the following figures, tick ( ) those which have corners. Do these figures have curved lines?

Answer : The correct answer is: The figures with curved lines are: Figure (i), (ii), (iv), (v), and (vii).

Question 11 : Using only straight lines, can you draw a figure which has no corners?

Answer : No, using only straight lines it is not possible to draw a figure which has no corners.

Question 12 : How many triangles do you have in your set? Are all of them equal in size? Find out.

Answer : In the given set, there are a total of 3 triangles. No, all of them are not in equal sizes.

Question 13 : Use the two small triangles in the tangram set to get the following shapes:

Answer : (1) Using triangle 2 and triangle 5.
(2) Using triangle 2 and triangle 5.
(3) Using triangle 2 and triangle 5

Question 14 : Which two pieces of the tangram set are exactly same? Find out.

Answer : Triangle 2 and triangle 5 are exactly same.

Question 15 : Take pieces 4 and 5 from the set and find out on which side of the triangle you can join the other piece.

Answer : Parallelogram 4 can be joined by slant side of the triangle 5.

Question 16 : Find matching sides among the following pairs of pieces. a) Pieces 1 and 2 b) Pieces 2 and 4 c) Pieces 1 and 5 d) Pieces 2 and 5

Answer :
a) The longest side of triangle 2 matches with one of the short sides of triangle 1.

b) The longest side of triangle 2 matches with one of the longest sides of parallelogram 4.

c) The longest side of triangle 5 matches with one of the short sides of triangle 1.

d) The longest side of triangle 2 matches with one of the longest sides of triangle 5. The short side of triangle 2 matches with one of the short sides of triangle 5.

Question 17 : Now try making the following shapes using only the pieces written here:

Answer :

Question 18 : Which geometrical shapes can you identify in these borders? Draw them in your notebook.
a) Is any shape repeating in a particular pattern? Which ones? Are the shapes made of
(i) Curved lines
(ii) Straight lines
(iii) Both curved and straight lines.
b) Look at your clothes, your mother's saris/shawls, rugs, and mats. Can you identify some patterns? Draw them in your notebook.

Answer : From these borders, it is easy to identify the circles, hexagons squares, triangles, parallelograms, and arcs.
a) Yes. Some shapes are repeating in a particular manner. These are hexagons, circles, squares, etc.
In the 1st pattern and these are repeating.
In the 2nd pattern and these are repeating.
In the 3rd pattern and these are repeating.
(b) (i) Yes, the shapes are made of curved lines.
(ii) Yes. The shapes are made of straight lines.
(iii) Yes. The shapes are made of both curved and straight lines.
(c) Do it by yourself

Question 19 : Among the following, can you match the tiles with the designs that they will make on the floor? Draw lines to match.

Answer : The correct answer is:

Question 20 : Complete the following tiling pattern.

Answer : The complete tiling pattern is given below

Question 21 : Complete this pattern. Compare it with the pattern on page 70 which also uses six-sided shapes. What is the difference between the two?

Answer : Complete the pattern by yourself. To compare both the patterns first observe the pattern given on page 70. That pattern has hexagons that are connected by their sides. In this pattern, the hexagons are connected through triangles. This is the difference between the two designs.

Question 22 : Khushboo and Hariz live in Agra. One day they went to see the Taj Mahal. The floor had the pattern shown below:
What do you think? Discuss with your friends.

Answer : Observing the pattern you can find that all the tiles used in the patterns are in the shape of hexagons.

Hexagons are placed horizontally and vertically to make the floor pattern.

Question 23 : The patterns below are made from this tile.

By using two colours it becomes a different pattern of blue and yellow flowers.
Use different colour combinations to make your own patterns.

Answer : Do it by yourself. Answers may vary. A sample answer is:

Question 24: Have you seen this shape in any other design — on a wall, a dress, on a basket, a mat, etc.?

Answer : Do it by yourself.

Question 25 : CFranke and Juhi's mummy has hidden a surprise gift for both of them. But she wants them to find out the gift through a treasure hunt. She has written some instructions here. Can you help Juhi and Franke in finding their gift?
a) Start from the tallest tree.
b) Go forward on the pathway.
c) From the sixth tile, turn left.
d) After moving a few steps again, you will find a plant on your right-hand side.
e) Colour the dress of the child playing closest to this plant.
f) Start moving again from the plant.
g) On the fourth tile, turn left again.
h) On the way, you will find the corner of the fourth tile is broken.
i) You will find a bat and a ball lying on the ground. Don't pick them up, just circle them.
j) Move ahead and turn right.
k) You will find a mango tree. A few mangoes can be seen on the tree. Colour 11 mangoes on the tree.
l) Also draw some grass near the mango tree and start moving again on the pathway.
m) When you go straight, you will find a house.
n) 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?

Answer : The correct answer is: