The given table is completed as shown:
Shape
Centre of Rotation
Order of Rotation
Angle of Rotation
Square
intersection point of digonals.
4
Rectangle
Intersection point of digonals.
2
Rhombus
Intersection point of digonals.
2
Equilateral Triangle
Intersection point of medians.
3
Regular Hexagon
Intersection point of...
(a) The given figure has rotational symmetry about so it has ordered as 2.
(b) The given figure has rotational symmetry about so it has ordered as 2.
(c) The given figure has rotational symmetry about so it has ordered as 3.
(d) The given figure has rotational symmetry about so it has ordered as 4.
(e) The given figure has rotational symmetry about so it has ordered as 4.
(f) The...
Among the above-given shapes, (a),(b), (d),(e) and (f) have more than one rotational symmetry.
This is because, in these figures, a complete turn, more than 1 number of times, an object look exactly the same.
All the triangles look same when rotated by . Thus, there are 4 positions at which the triangle looks exactly the same when rotated about its centre by 120°.
(a) An equilateral triangle
The number of lines of symmetry = 3
(b) An isosceles triangle
The number of lines of symmetry = 1
(c) A scalene triangle
The number of lines of symmetry = 0
(d) A square
The number of lines of symmetry = 4
(e) A rectangle
The number of lines of symmetry = 2
(f) A rhombus
...