A figure which is identical on both sides of LINE is said to be symmetrical about that line and that line is called line of symmetryor axsis of symmetry. Line of symetry is also called 'mirror line'
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M Z C X B N
The letters H and Z have both line symmetry and rotational symmetry
An equilateral triangle has both line symmetry and rotational symmetry. A non-equilateral isosceles triangle has line symmetry but not rotational symmetry. A scalene triangle has neither kind of symmetry.
Lines of symmetry are 2 dimensional. Planes of symmetry are 3D.
Approximate Symmetry is approximately symmetrical. Regular Symmetry is Symmetrical for sure.