Printable Textbook: Where to Look From - Level 3 | Mental Maths - Class 1 PDF Download

 Page 1


Where to look from
Summary
A three dimensional object has three different views:
 1. Top view
 2. Front view
 3. Side view
For example
A Tissue box   
Front
Side
Top
   has these three different 
views when looked up from different sides: 
 Top view Front view Side view
Mirror Symmetry
It occurs when two halves of object is the mirror images of each other.
Page 2


Where to look from
Summary
A three dimensional object has three different views:
 1. Top view
 2. Front view
 3. Side view
For example
A Tissue box   
Front
Side
Top
   has these three different 
views when looked up from different sides: 
 Top view Front view Side view
Mirror Symmetry
It occurs when two halves of object is the mirror images of each other.
2
ME NT AL
MA
T
HS
For example
The left half of the kite and its mirror image also depict the whole kite, 
therefore the kite has mirror symmetry.
Line of Symmetry
It is a line that divides an object into two exactly same halves.
Questions
1. How many lines of symmetry are there in a rectangle?
2. Which solid geometrical figures look same if viewed from all the sides?
3. Amongst the English alphabets A, B, C and G which one does not have any 
line of symmetry?
4. Which paper cannot be folded into exactly two equal halves?
 (a) (b) (c) (d)
M
A
Line of Symmetry Line of Symmetry
Page 3


Where to look from
Summary
A three dimensional object has three different views:
 1. Top view
 2. Front view
 3. Side view
For example
A Tissue box   
Front
Side
Top
   has these three different 
views when looked up from different sides: 
 Top view Front view Side view
Mirror Symmetry
It occurs when two halves of object is the mirror images of each other.
2
ME NT AL
MA
T
HS
For example
The left half of the kite and its mirror image also depict the whole kite, 
therefore the kite has mirror symmetry.
Line of Symmetry
It is a line that divides an object into two exactly same halves.
Questions
1. How many lines of symmetry are there in a rectangle?
2. Which solid geometrical figures look same if viewed from all the sides?
3. Amongst the English alphabets A, B, C and G which one does not have any 
line of symmetry?
4. Which paper cannot be folded into exactly two equal halves?
 (a) (b) (c) (d)
M
A
Line of Symmetry Line of Symmetry
3
ME NT AL
MA
T
HS
5. How many lines of symmetry (mirror) the following figure has?
6. How many dots are visible if a dice as shown below is viewed from top?
7. How many dots are visible if a dice as shown below is viewed from left side?
8. Which is the mirror image of N?
 (a) (b) (c) (d)
9. Which is different?
 (a) (b) (c) (d)
10. In which figure the dotted line does not represent the ‘line of symmetry’?
  (a) (b) (c) (d)
ZN N Z
H
Page 4


Where to look from
Summary
A three dimensional object has three different views:
 1. Top view
 2. Front view
 3. Side view
For example
A Tissue box   
Front
Side
Top
   has these three different 
views when looked up from different sides: 
 Top view Front view Side view
Mirror Symmetry
It occurs when two halves of object is the mirror images of each other.
2
ME NT AL
MA
T
HS
For example
The left half of the kite and its mirror image also depict the whole kite, 
therefore the kite has mirror symmetry.
Line of Symmetry
It is a line that divides an object into two exactly same halves.
Questions
1. How many lines of symmetry are there in a rectangle?
2. Which solid geometrical figures look same if viewed from all the sides?
3. Amongst the English alphabets A, B, C and G which one does not have any 
line of symmetry?
4. Which paper cannot be folded into exactly two equal halves?
 (a) (b) (c) (d)
M
A
Line of Symmetry Line of Symmetry
3
ME NT AL
MA
T
HS
5. How many lines of symmetry (mirror) the following figure has?
6. How many dots are visible if a dice as shown below is viewed from top?
7. How many dots are visible if a dice as shown below is viewed from left side?
8. Which is the mirror image of N?
 (a) (b) (c) (d)
9. Which is different?
 (a) (b) (c) (d)
10. In which figure the dotted line does not represent the ‘line of symmetry’?
  (a) (b) (c) (d)
ZN N Z
H
4
ME NT AL
MA
T
HS
11. Which is the line of symmetry in the figure given below?
12. Which is the mirror image of B?
 (i) (ii) (iii) (iv)
13. Tell the names of any four English alphabets whose mirror image is same 
as alphabet.
14. If I look at a car from the terrace, which shape would be seen?
15. How many lines of symmetry are there in a square?
Answer Key
1. Two  9. C
2. Cube and Sphere  10. A
3. G 11. Line n
4. C 12. (iii) 
5. No line of symmetry  13. A, H, I, M, O, T, U, V , X (Any four)
6. 4 dots  14. Rectangle
7. One dot  15. Four
8. C
l
m
n q
B B
B
B
B B
B
B
Page 5


Where to look from
Summary
A three dimensional object has three different views:
 1. Top view
 2. Front view
 3. Side view
For example
A Tissue box   
Front
Side
Top
   has these three different 
views when looked up from different sides: 
 Top view Front view Side view
Mirror Symmetry
It occurs when two halves of object is the mirror images of each other.
2
ME NT AL
MA
T
HS
For example
The left half of the kite and its mirror image also depict the whole kite, 
therefore the kite has mirror symmetry.
Line of Symmetry
It is a line that divides an object into two exactly same halves.
Questions
1. How many lines of symmetry are there in a rectangle?
2. Which solid geometrical figures look same if viewed from all the sides?
3. Amongst the English alphabets A, B, C and G which one does not have any 
line of symmetry?
4. Which paper cannot be folded into exactly two equal halves?
 (a) (b) (c) (d)
M
A
Line of Symmetry Line of Symmetry
3
ME NT AL
MA
T
HS
5. How many lines of symmetry (mirror) the following figure has?
6. How many dots are visible if a dice as shown below is viewed from top?
7. How many dots are visible if a dice as shown below is viewed from left side?
8. Which is the mirror image of N?
 (a) (b) (c) (d)
9. Which is different?
 (a) (b) (c) (d)
10. In which figure the dotted line does not represent the ‘line of symmetry’?
  (a) (b) (c) (d)
ZN N Z
H
4
ME NT AL
MA
T
HS
11. Which is the line of symmetry in the figure given below?
12. Which is the mirror image of B?
 (i) (ii) (iii) (iv)
13. Tell the names of any four English alphabets whose mirror image is same 
as alphabet.
14. If I look at a car from the terrace, which shape would be seen?
15. How many lines of symmetry are there in a square?
Answer Key
1. Two  9. C
2. Cube and Sphere  10. A
3. G 11. Line n
4. C 12. (iii) 
5. No line of symmetry  13. A, H, I, M, O, T, U, V , X (Any four)
6. 4 dots  14. Rectangle
7. One dot  15. Four
8. C
l
m
n q
B B
B
B
B B
B
B
5
ME NT AL
MA
T
HS
ACTIVITY
1. Draw the lines of symmetry in the following figures and also mention 
the number of lines of symmetry:
  (A) (B)
  Square Rectangle
 No. of Lines of Symmetry   
  (C) (D)
  Equilateral triangle Butterfly
 No. of Lines of Symmetry     
2. Guess the words by looking at their halves.
  (A) (B) (C)
WORDS:   
 
W
O
W
M
A
T
BOOK