Symmetry

Question

Draw, wherever possible, a rough sketch of

(i) a triangle with both line and rotational symmetries of order more than 1.

(ii) a triangle with only line symmetry and no rotational symmetry of order more than 1.

(iii) a quadrilateral with a rotational symmetry of order more than 1 but not a line symmetry.

(iv) a quadrilateral with line symmetry but not a rotational symmetry of order more than 1.

Answer

(i) Equilateral triangle has 3 lines of symmetry and rotational symmetry of

order 3.

(ii) Isosceles triangle has only 1 line of symmetry and no rotational symmetry of order more than 1.

(iii) A parallelogram is a quadrilateral which has no line of symmetry but a rotational symmetry of order 2.

(iv)A kite is a quadrilateral which has only 1 line of symmetry and no rotational symmetry of order more than 1.

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Some More Questions From Symmetry Chapter

The following figures have more than one line of symmetry. Such figures are said to have multiple lines of symmetry.

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Identify multiple lines of symmetry, if any, in each of the following figures:

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Copy the figure given here.

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Take any one diagonal as a line of symmetry and shade a few more squares to make the figure symmetric about a diagonal. Is there more than one way to do that? Will the figure be symmetric about both the diagonals?

Copy the diagram and complete each shape to be symmetric about the mirror line (s):

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State the number of lines of symmetry for the following figures:

(a) An equilateral triangle

(b) An isosceles triangle

(c) A scalene triangle

(d) A square

(e) A rectangle

(f) A rhombus

(g) A parallelogram

(h) A quadrilateral

(i) A regular hexagon

(j) A circle

Give three examples of shapes with no line of symmetry.

What other name can you give to the line of symmetry of

(a) an isosceles triangle?

(b)a circle?

Give the order of rotational symmetry for each figure:

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Name any two figures that have both line symmetry and rotational symmetry.

Draw, wherever possible, a rough sketch of

(i) a triangle with both line and rotational symmetries of order more than 1.

(ii) a triangle with only line symmetry and no rotational symmetry of order more than 1.

(iii) a quadrilateral with a rotational symmetry of order more than 1 but not a line symmetry.

(iv) a quadrilateral with line symmetry but not a rotational symmetry of order more than 1.

If a figure has two or more lines of symmetry, should it have rotational symmetry of order more than 1?