yes they do
not all shapes have lines of symmetry. one example is a triangle.
All regular octagons have the same number of lines of symmetry, but octagons with unequal sides would have fewer lines of symmetry.
no, only equilateral triangles have 3 lines of symmetry
All trapeziums have no lines of symmetry unless it is an isosceles trapezium which has one line of symmetry
yes they do
If the question refers to a single completely geometrically straight line of finite length in a plane, then a straight line will have two lines of symmetry. One symmetry line is perpendicular to the line being discussed and one symmetry line coincides with the line being discussed. The symmetry operation here is the one where every point of the figure is flipped perpendicularly across the symmetry line and the object is symmetric if that flipping produced exactly the same set of points. (Said differently, if flipping the set of points through a line produced an exact replica of the original set of points, then the like determining the flip is a symmetry line.) One level of complication occurs if the straight line which is the subject of the symmetry question is an infinitely long straight line. In such a case one symmetry line still coincides with the actual line, but all lines that are perpendicular to the straight line will be lines of symmetry. Thus, an infinitely long straight line has no single point as its "middle" and has an infinitely many symmetry lines consisting of all possible lines perpendicular to the original line.
2
not all shapes have lines of symmetry. one example is a triangle.
All regular octagons have the same number of lines of symmetry, but octagons with unequal sides would have fewer lines of symmetry.
Not all 4 sided quadrilaterals have lines of symmetry although some of them do have lines of symmetry.
no, only equilateral triangles have 3 lines of symmetry
All trapeziums have no lines of symmetry unless it is an isosceles trapezium which has one line of symmetry
1 straight down the middle
First of all, your grammar is terrible. The question should be "Does a triangle have 2 lines of symmetry and 2 lines of rotational symmetry? and the answer is no. A triangle can not have 2 lines of rotational symmetry, because you only rotate the image, you do not use any lines.
A pineapple typically has no lines of symmetry, as its irregular shape does not allow for any straight line to divide it into two equal halves. The pineapple's spiky leaves and uneven surface make it asymmetrical from all angles. Therefore, it does not exhibit any lines of symmetry in the way that geometric shapes like squares or circles do.
A circle has infinitely many points of symmetry. Every straight line that passes through the center of a circle is a line of symmetry.