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A letter C has 1 line of symmetry. A line of symmetry is a line that divides a shape into two equal halves that are mirror images of each other. In the case of the letter C, a vertical line passing through the center of the letter would be the line of symmetry.
no concave mirror is in shape of concave mirror
a diameter for a circle possibly a bisector for other shapes
An arrow typically exhibits reflectional symmetry, also known as mirror symmetry. This means that if you were to draw a line down the center of the arrow, the two halves would be mirror images of each other. Arrows do not usually have rotational symmetry, as rotating them around a point would not result in the same shape.
A dotted line can be a line of symmetry if it divides a shape into two equal parts that are mirror images of each other. In geometry, a line of symmetry is a line that divides a shape into two congruent parts. Whether a dotted line is a line of symmetry depends on the specific shape and the placement of the line.