How many lines of symmetry are there in a circle?

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A 6
B 3
C ∞
D 10

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Answer: C. ∞

A line of symmetry splits a shape into two mirror halves. Any straight line through the centre of a circle does this, and there are endlessly many such lines, so a circle has infinite lines of symmetry.

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How many lines of symmetry are there in a circle?

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