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

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 18B.

**Other Exercises**

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

**Question 1.**

**Solution:**

(a) An equilateral triangle has three lines of symmetry which are the angle bisectors.

(b) It has three order of rotational symmetry.

**Question 2.**

**Solution:**

The rectangle should be rotated through 180° and 360° to be in symmetrical position with the original position as given below :

**Question 3.**

**Solution:**

A square has four orders of rotational symmetry and angles through which the rotational symmetry are 90°, 180°, 270° and 360° as given below:

**Question 4.**

**Solution:**

(i) A rhombus has two lines of symmetry which are its diagonal.

(ii) Order of rotational symmetry of a rhombus is not possible. Therefore it has no rotational symmetry.

**Question 5.**

**Solution:**

Three letters of the English Alphabet which have two lines of symmetry and rotational symmetry of order 2 are H, I and N.

**Question 6.**

**Solution:**

The figure which has only on line of symmetry but no rotational symmetry order is an isosceles triangle.

**Question 7.**

**Solution:**

No, only isosceles trapezium has a line of symmetry but not every trapezium.

**Question 8.**

**Solution:**

The line of symmetry of a semicircle is the perpendicular bisector of the diameter No, it has not any rotational symmetry.

**Question 9.**

**Solution:**

A scalene triangle has neither any line of symmetry nor a rotational symmetry.

**Question 10.**

**Solution:**

In the given figure, the line of symmetry has been drawn which is one. There is no rotational symmetry of this figure.

**Question 11.**

**Solution:**

(i) The given figure has two lines of symmetry which has been drawn.

(ii) It has three orders of the rotational symmetry which are 90°, 270° and 360°.

**Question 12.**

**Solution:**

There is one letter of the English Alphabet Z which has no line of symmetry but it has order two of rotational symmetry of 180° and 360°.

Hope given RS Aggarwal Solutions Class 7 Chapter 18 Reflection and Rotational Symmetry Ex 18B are helpful to complete your math homework.

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