From the circle with center A, DE and CF are diameter while FA and EA are radius.
Circle
A circle is the locus of a point such that the distance from the fixed point known as the center is constant.
A segment is a line that touches two points on the edge of a circle. Diameter is a line segment that passes the center of the circle while the radius is half of the diameter.
From the circle with center A, DE and CF are diameter while FA and EA are radius.
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