NCERT Solutions for Class 7 Maths Chapter 14 Symmetry InText Questions

These NCERT Solutions for Class 7 Maths Chapter 14 Symmetry InText Questions and Answers are prepared by our highly skilled subject experts.

NCERT Solutions for Class 7 Maths Chapter 14 Symmetry InText Questions

Question 1.
(a) Can you now tell the order of the rotational symmetry for an equilateral triangle? Look at the following figures.

(b) How many positions are there at which the triangle looks exactly the same, when rotated about its centre by 120°?
Answer:
(a) There are exactly three positions where the triangle looks the same?
∴ It has a rotational symmetry of order 3.
(b) There is only one position where the triangle looks exactly the same, when rotated about its centre through 120°?

Question 2.
Which of the following shapes have rotational symmetry about the marked point?

Answer:
All the above shapes (i) (ii) (iii) and (iv) have rotational symmetry about the marked point.

NCERT In-text Question Page No. 273

Question 1.
Give the order of the rotational symmetry of the given figures about the point marked x.

Answer:
The order of the rotational symmetry is 4.

The order of rotational symmetry is 3.

The order of the rotational symmetry is 3.
(iii)

The order of the rotational symmetry is 2.

NCERT In-text Question Page No. 275

Question 1.
Some of the English alphabets have fascinating symmetrical structures. Which capital letters have just one line of symmetry (like E)? Which capital letters have a rotational symmetry of order 2 (like I)? By attempting to think on such lines, you will be able to fill in the following table:
Answer: