What is the rotational symmetry of an pair of spectacles with examples with image
No, they are not.
a trapezoid has a pair of symmetry lines but a square diamond or parallelogram all sides are parallel
Square
A regular polygon with x sides has x lines of symmetry. Each line of symmetry passes through a vertex and the midpoint of the opposite side. For example, a regular hexagon has 6 lines of symmetry, one for each pair of opposite sides. The formula for calculating the number of lines of symmetry in a regular polygon is equal to the number of sides x.
10 One through each pair of vertices, and one through each pair of midpoints - of opposite sides.
A general trapezoid is a 4 sided quadrilateral with a pair opposite parallel lines of different lengths and no lines of symmetry But an isosceles trapezoid has the same properties as above except that it has 1 line of symmetry
The only known shapes with two lines of symmetry are rhombus and rectangles. These shapes are found by the test of line of symmetry of certain shapes.Sketch a rectangle, which has two pair of congruent and parallel lines and all right angles. Indicate the lines of symmetry. They should pass through each opposite midpoint of the segments of the rectangles.Sketch a rhombus, the shape that has all congruent sides, but have two pairs of congruent angles, which are different from another. Indicate the lines of symmetry. They should pass through both opposite vertices of the rhombus.
A rectangle.
2 pairs of parrallel lines
2 pairs of parallel lines
Because they have a pair of lenses.