I'm sure that is the Antarctic Circle.
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another name for a half circle is semi-circle
We call it a circle.
A quarter of a circle is a turn of 90 degrees'
A circle
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.