Maths 3 Mark Question

Figures	Centre of rotation	Order of rotation	Angle of rotation
Square	Point of intersection of the line segments joining the mid-points of opposite sides.	4	90
Rectangle	Point of intersection of the line segments joining the mid-points of opposite sides.	2	180
Rhombus	Point of intersection of diagonals.	2	180
Equilateral triangle	Point of intersection of angle bisectors i.e, centroid.	3	120
Regular hexagon	Centre of the hexagon.	6	60
Circle	Centre of the circle.	Unlimited	Any angle
Semi-circle	Nil	Nil	Nil

An equilateral triangle has 3 lines of symmetry and a rotational symmetry of order 3.

A semicircle (half of a circle) has only one line of symmetry. In the figure, there is one line of symmetry. The figure is symmetric along the perpendicular bisector I of the diameter XY.A semi-circle does not have any rotational symmetry.

English alphabet Letter	Line Symmetry	Number of Lines of symmetry	Rotational Symmetry	Order of rotational Symmetry
Z	No	0	Yes	2
S	No	0	Yes	2
H	Yes	2	Yes	2
O	Yes	4	Yes	2
E	Yes	1	No	0
N	No	0	Yes	2
C	Yes	1	No	0