Just the one and it is its radius when at right angles to the semi-circle's centre
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There are an infinite number of lines of symmetry in a circle, as any diameter will be a line of symmetry and there are an infinite number of angle measure for that line to pass through.
I would think there would be an infinite number of lines of symmetry. Any line passing through the center of the circle, regardless of the angle will be a symmetry line.
1Impoved Answer:-A circle has infinite lines of symmetry
A circle has infinite lines of symmetry, any line going through the center is a line for symmetry.
There are infinite lines of symmetry, as in the case of a circle, the diagonal is the line of symmetry. The diagonal can start at an infinite number of places, and thus there are endless possible lines of symmetry.