Symmetry (Exercise 18.2) RD Sharma Solutions | Mathematics (Maths) Class 7 (Old NCERT) PDF Download

 Page 1


 
 
 
 
 
 
 
 
         
 
1. In the following figures, the mirror line (i.e. the line of symmetry) is given as dotted 
line. Complete each figure performing reflection in the dotted (mirror) line. Also, try to 
recall name of the complete figure. 
 
Solution: 
(a) It will be a rectangle. 
 
 
(b) It will be triangle 
Page 2


 
 
 
 
 
 
 
 
         
 
1. In the following figures, the mirror line (i.e. the line of symmetry) is given as dotted 
line. Complete each figure performing reflection in the dotted (mirror) line. Also, try to 
recall name of the complete figure. 
 
Solution: 
(a) It will be a rectangle. 
 
 
(b) It will be triangle 
 
 
 
 
 
 
 
 
 
 
(c) It will be rhombus 
 
 
(d) It will be circle 
 
 
(e) It will be pentagon 
Page 3


 
 
 
 
 
 
 
 
         
 
1. In the following figures, the mirror line (i.e. the line of symmetry) is given as dotted 
line. Complete each figure performing reflection in the dotted (mirror) line. Also, try to 
recall name of the complete figure. 
 
Solution: 
(a) It will be a rectangle. 
 
 
(b) It will be triangle 
 
 
 
 
 
 
 
 
 
 
(c) It will be rhombus 
 
 
(d) It will be circle 
 
 
(e) It will be pentagon 
 
 
 
 
 
 
 
 
 
 
(d) It will be octagon 
 
 
2. Each of the following figures shows paper cuttings with punched holes. Copy these 
figures on a plane sheet and mark the axis of symmetry so that if the paper is folded 
along it, then the wholes on one side of it coincide with the holes on the other side. 
Page 4


 
 
 
 
 
 
 
 
         
 
1. In the following figures, the mirror line (i.e. the line of symmetry) is given as dotted 
line. Complete each figure performing reflection in the dotted (mirror) line. Also, try to 
recall name of the complete figure. 
 
Solution: 
(a) It will be a rectangle. 
 
 
(b) It will be triangle 
 
 
 
 
 
 
 
 
 
 
(c) It will be rhombus 
 
 
(d) It will be circle 
 
 
(e) It will be pentagon 
 
 
 
 
 
 
 
 
 
 
(d) It will be octagon 
 
 
2. Each of the following figures shows paper cuttings with punched holes. Copy these 
figures on a plane sheet and mark the axis of symmetry so that if the paper is folded 
along it, then the wholes on one side of it coincide with the holes on the other side. 
 
 
 
 
 
 
 
 
 
Solution: 
The lines of symmetry in the given figures are as follows: 
   
Page 5


 
 
 
 
 
 
 
 
         
 
1. In the following figures, the mirror line (i.e. the line of symmetry) is given as dotted 
line. Complete each figure performing reflection in the dotted (mirror) line. Also, try to 
recall name of the complete figure. 
 
Solution: 
(a) It will be a rectangle. 
 
 
(b) It will be triangle 
 
 
 
 
 
 
 
 
 
 
(c) It will be rhombus 
 
 
(d) It will be circle 
 
 
(e) It will be pentagon 
 
 
 
 
 
 
 
 
 
 
(d) It will be octagon 
 
 
2. Each of the following figures shows paper cuttings with punched holes. Copy these 
figures on a plane sheet and mark the axis of symmetry so that if the paper is folded 
along it, then the wholes on one side of it coincide with the holes on the other side. 
 
 
 
 
 
 
 
 
 
Solution: 
The lines of symmetry in the given figures are as follows: 
   
 
 
 
 
 
 
 
 
 
 
3. In the following figures if the dotted lines represent the lines of symmetry, find the 
other hole(s).