Symmetry is understood as a balanced structure in which a figure or design can be divided by a line so that the two parts match as mirror images, with corresponding features the same distance from the line. This includes recognizing lines of symmetry in familiar two-dimensional shapes and pictures and distinguishing symmetry from mere visual balance; rotational symmetry, formal transformations, and algebraic descriptions of symmetry are not included.
A figure has a line of symmetry when one line divides it into two matching mirror-image parts.
To check, imagine folding the figure along the line. If every part on one side lands exactly on its matching part on the other side, the line is a line of symmetry.
Example: A butterfly has a dotted line drawn straight down the middle of its body. Is the dotted line a line of symmetry?
So, yes, the dotted line is a line of symmetry. The butterfly is not just balanced in appearance; its matching parts are mirror images across the line.
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