A shape has rotational symmetry if it looks the same when rotated (before completing 360ยฐ). Order of rotational symmetry = number of times it looks the same in one full rotation. Square: looks same at 90ยฐ, 180ยฐ, 270ยฐ, 360ยฐ โ order 4. Equilateral triangle: at 120ยฐ, 240ยฐ, 360ยฐ โ order 3. Circle: at any angle โ infinite. Rectangle: 180ยฐ and 360ยฐ โ order 2. Most shapes have both line and rotational symmetry.
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