In this page we have Important Questions Class 7 Maths Chapter 12: Symmetry . Hope you like them and do not forget to like , social share
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Question 1.
(i) A figure has __________ symmetry if there is a line about which the figure may be folded so that the two parts of the figure coincide.
(ii) A regular pentagon has ____________ line of symmetry.
(iii) A figure has ____________ symmetry if after a rotation through a certain angle. The figure looks exactly the same.
(iv)A __________ triangle has no lines of symmetry
(v) Each regular polygon has as many lines of symmetry as it has _____________.
(vi) The concept of line symmetry is closely related to __________ reflection.
(vii)The quadrilateral that has four lines of symmetry and order-four rotational symmetry is a _______________.
(viii) The angle of rotational symmetry for letter S is ________________.
(ix) A line segment is symmetrical about its _______________________________.
(x) Rotation turns an object about a fixed point. The fixed point is called ________________.
(xi)Each of the letters H, N, S and Z has a rotational symmetry of order __________.
(xii) The line of symmetry of an isosceles triangle is its ______________________ from the vertex having the equal sides.
Answer
(i) Line
(ii) 5
(iii) rotational
(iv)Scalene
(v) number of sides
(vi) mirror
(vii) square
(viii)180°, 360°
(ix) perpendicular bisector
(x) center of rotation
(xi) 2
(xii) Median or altitude
State true or false
Question 2.
(i) When an object rotates, its shape changes.
(ii) if a shape possess rotational symmetry, it will surely have line of symmetry.
(iii) We can not have a rotational symmetry of order more than 1 whose angle of rotation is 23°
(iv) A pentagon which has more than one line of symmetry must be regular.
(v)A regular hexagon has six lines of symmetry.
(vi) A figure having two or more lines of symmetry has rotational symmetry of order more than 1.
(vii) The wheel of a bicycle can rotate both ways clockwise and anticlockwise.
(viii) The centre of rotation in a parallelogram is the point of intersection of its diagonals.
(ix) An equilateral triangle has six lines of symmetry
(x) Rotation turns an object about a fixed point which is known as centre of rotation.
Question 3.
In the word "MATHS" which of the following pairs of letters shows rotational symmetry
(a) M and T
(b) H and S
(c) A and S
(d) T and S Question 4.
How many letters in the word SNAIL have line symmetry?
(a) 2
(b) 3
(c) 4
(d) 1 Question 5.
Order of rotational symmetry of
(a) 6
(b) 4
(c) 8
(d) 2 Question 6.
Which of the following letters of English alphabets have more than 2 lines of symmetry?
(a) Z
(b) O
(c) C
(d) H Question 7.
Which of the following figures do not have line symmetry? Question 8.
Which of the following figures do not have rotational symmetry?
Answer 3-8
3. (b)
4. (a)
5. (c)
6. (b)
7. (c)
8. (d)
Match the Column
Question 9.
Match order of rotational symmetry of these shapes:
