Question

Mention the order of rotational symmetry in the following figures: [4 MARKS]

Answer 1

Figures with order of symmetry 4: 1 Mark
Figures with order of symmetry 3: 1 Mark
Figures with order of symmetry 2: 1 Mark
Figures with order of symmetry 1: 1 Mark

Figures (a) and (f) will look the same if rotated by 90${}^o$, 180${}^o$, 270${}^o$ or 360${}^o$. Hence, they have an order of 4.

Figures (b) and (e) will look the same if rotated by 120${}^o$, 240${}^o$ or 360${}^o$. Their order of rotational symmetry will thus be 3.

If we rotate figure (d) by 180${}^o$ or 360${}^o$, we will get the same figure. Hence, it has an order of 2.

But option (c) has an order of only 1 since the same figure can be obtained if the figure is rotated by 360${}^o$.