RS Aggarwal Class 7 Solutions Chapter 18 Reflection and Rotational Symmetry Ex 18A

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RS Aggarwal Class 7 Solutions Chapter 18 Reflection and Rotational Symmetry Ex 18A

These Solutions are part of RS Aggarwal Solutions Class 7. Here we have given RS Aggarwal Solutions Class 7 Chapter 18 Reflection and Rotational Symmetry Ex 18A.

Other Exercises

Tick (✓) the correct answer in each of Q.1 to Q.9
Question 1.
Solution:
(a) A scalene triangle has no line of symmetry

Question 2.
Solution:
(c) A rectangle has two lines of symmetry which are the lines joining the mid points of opposite sides.

Question 3.
Solution:
(d) A square has four lines of symmetry which are two diagonal and two the lines joining the mid points of opposite sides.

Question 4.
Solution:
(b) A rhombus has two lines of symmetry which are the diagonals.

Question 5.
Solution:
(d) A circle has an unlimited number of lines of symmetry as its lines of symmetry is its diameter which are infinite in number.

Question 6.
Solution:
(a) ∆ABC in which AB = AC, is an isosceles triangle and AD ⊥ BC.
RS Aggarwal Class 7 Solutions Chapter 18 Reflection and Rotational Symmetry Ex 18A 1
AD is the line of symmetry

Question 7.
Solution:
(a) ABCD is a kite in which AB = AD and BC = DC
RS Aggarwal Class 7 Solutions Chapter 18 Reflection and Rotational Symmetry Ex 18A 2
Its line of symmetry will be one diagonal AC.

Question 8.
Solution:
(c) The letter O of the English Alphabet has two lines of symmetry as shown here in the figure.
RS Aggarwal Class 7 Solutions Chapter 18 Reflection and Rotational Symmetry Ex 18A 3

Question 9.
Solution:
(a) The letter Z of the English Alphabet has no line of symmetry.

Question 10.
Solution:
The line/lines of symmetry have been drawn as given below :
RS Aggarwal Class 7 Solutions Chapter 18 Reflection and Rotational Symmetry Ex 18A 4

Question 11.
Solution:
(i) True
(ii) True
(iii) True : The bisectors of angles are its lines of symmetry.
(iv) False : A rhombus has two lines of symmetry which are its diagonals.
(v) True : The two diagonals and two perpendicular bisector of its opposite sides are the lines of symmetry.
(vi) True : The perpendicular bisectors of opposite sides are the two lines of symmetry of the rectangle.
(vii) True : Each of the English Alphabet H, I, O and X has two lines of symmetry.

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