The 2 halves in a circle are the 2 semi circles.
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a hemisphere
diameter. a radius doesn't even run through a circle. a circumference is the line that surrounds the circle.
a diameter for a circle possibly a bisector for other shapes
A circle has an infinite number of lines of symmetry. As long as the line passes over the center point it cuts the circle in two identical halves.
The other name for the line of symmetry of a circle is the diameter. The diameter of a circle is a line segment that passes through the center of the circle and has endpoints on the circle itself. It divides the circle into two equal halves, making it a line of symmetry. This means that if you were to fold the circle along the diameter, both halves would perfectly overlap.