To count how many different central angles a circle has, count how many different
numbers there are between zero and 360. Include all of the possible fractions.
You should discover that the number is very big.
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There's an infinite number of lines of symmetry in a circle.
The number of square corners in a circle is infinite because it has no definite angle.
A circle has an infinite number of lines of symmetry. Any chord of the circle that passes through its center will be a line of symmetry. And there are an infinite number of lines that can be drawn through the center of the circle, the length of which is equal to the diameter of the circle.
An oval has no exterior angles (or an infinite number depending on your point of view !)
a circle?