Technically there are an infinite number of radii in a circle. A radius is a line from the center of the circle to a point on its edge, and since there are an infinite number of points on a circle's edge there are an infinite number of radii.
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In the same circle, or in congruent circles, two minor arcs are congruent if and only if their corresponding chords are congruent.
An arc (circumference only), or a segment.
Only when one of them is the circle's diameter which is the circle's largest chord.
there are two Pi in a full circle so there is only one Pi in one radian.
Only round the perimeter of the circle (not across its interior) because a segment is a part of a line or curve between two points.