Page 192 - Maths Skills - 7
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190 Maths
Example 2: Find which of the following figures have rotational symmetry. Also write the order of symmetry.
Solution: Figure (i) has rotational symmetry of order 3. Fact-o-meter
Figure (ii) has no rotational symmetry. In Fig. (iii) there are four circles
Figure (iii) and (iv) have rotational between a circle, therefore the
symmetry of order 4. rotational symmetry is limited to
order 4.
Exercise 11.2
1. Draw the figures when the following are rotated through 90° and 180° with A as centre of rotation and AB as
a reference line.
2. Identify and write the type/types of symmetry (Reflection/Rotational or both) in each of the following.
3. Fill in the blanks.
(i) A circle has ________________ rotational symmetry.
(ii) A square has rotational symmetry of order ________________.
(iii) An isosceles triangle has _____ rotational symmetry and ________________ lines of symmetry.
(iv) A line XY has ________________ line of symmetry and ________________ rotational symmetry.
(v) A rotational symmetry of order ________________ is also called point symmetry.
(vi) Another name for reflection symmetry is ________________ symmetry.
