If you draw a line from the center of a circle to the edge of a circle, you have drawn the radius of the circle.
If you draw a line from the edge of a circle through the center of the circle and on to the edge on the opposite side, you have drawn the diameter of a circle.
The radius of a circle is one half the diameter of a circle.
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The area of S is 16 square inches.
It is the radius of the circle
360
s diameter of the circle in the drawing above is the segment
They are straight lines, part s of which form chords of the circle.