Trace the figure. Then turn the tracing paper over so that the pencil marks are on the opposite side of the paper. If you can find a position in which the original figure and the inverted trace match up, you have a line of symmetry.
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You can flip the traced version along various lines. If the flipped shape matches the original then the that is a line of symmetry. Alternatively, if you can find a fold such that the two halves of the tracing match then the fold line is a line of symmetry.
Look at a shape and see if you can see that two halves mirror each other. To check, get a mirror and put it along this line. If the shape still looks the same using the mirror you have a line of symmetry. You can also trace half of the shape, turn the tracing paper over, put it on the other half of the shape and check it is the same. Yes another way to do it is think REFLECTION. If they are exactly the same, you have a line of symmetry!
It would be hard to find a line of symmetry on a moon, as it is likely to be irregularly shaped.
A symmetrical shape is said to have line symmetry. A shape that has line symmetry can have one or more lines of symmetry
There are an infinite number of lines of symmetry in a circle, as any diameter will be a line of symmetry and there are an infinite number of angle measure for that line to pass through.