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It's b. rotational on apex

A line has two-fold rotational symmetry.

What is rotational symmetry of line ?

Rotational symmetry is when a shape or pattern can be rotated or turned around a central point and remains the same. It may be stated that a shape has a rotational symmetry of order X which means that the shape can be turned around a central point and remain the same X times.

How line has two-fold rotational symmetry ?

The two-fold rotation is the rotation of the geometric figure at an angle of 180° about its center. Thus a line can be rotated freely at an angle of 180° from its center point and therefore it has two-fold of rotational symmetry.

To learn more about rotational symmetry, refer -

https://brainly.com/question/20969283

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