An figure that has an order 3 rotational symmetry can be rotated 120 degrees around its center and still look the same, meaning it can be rotated three times (including the original position) to complete a full rotation of 360 degrees.
Among the options given:
- Right triangle: does not have rotational symmetry.
- Equilateral triangle: has order 3 rotational symmetry (120 degrees).
- Regular hexagon: has order 6 rotational symmetry.
- Right trapezoid: does not have rotational symmetry.
Therefore, the figure that has an order 3 rotational symmetry is the equilateral triangle.
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