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S seema garhwal
The quadrilaterals which have both line and rotational symmetry of order more than 1 are : 1. Rectangle  2. Square 3. Rhombus
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...

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S seema garhwal
Yes. If a figure has two or more lines of symmetry,than it  should  have rotational symmetry of order more than 1.
A quadrilateral with line symmetry but not a rotational symmetry of order more than 1 is kite.

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S seema garhwal
A quadrilateral with a rotational symmetry of order more than 1 but not a line symmetry is parallelogram.
A triangle with only line symmetry and no rotational symmetry of order more than 1 is isosceles triangle.
The  two figures that have both line symmetry and rotational symmetry are : (i) Equilateral triangle  (ii) Regular hexagon
(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...

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S seema garhwal
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.
Among the above-given shapes, (i),(ii) and (iv) have rotational symmetry about the marked point.

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S seema garhwal
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°.
An equilateral triangle has rotational symmetry at  angle. The order of the rotational symmetry for an equilateral triangle is 3.           

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S seema garhwal
The other name we can give to the line of symmetry of a circle is the diameter.

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S seema garhwal
The line of symmetry of an isosceles triangle is median or altitude.

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S seema garhwal
The  three examples of shapes with no line of symmetry are : 1. Quadrilateral  2. Scalene triangle  3.Parallelogram

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S seema garhwal
  (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  ...
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