Determine whether the given statement is always, sometimes or never true.
1) opposite angles of an inscribed quadrilateral are supplementary.
2) a chord in a circle contains a radius.
3) a minor arc is an arc whose measure is less than 90°.
4) if an angle is inscribed in a circle, then the measure of the angle equals the measure of its intercepted arc.
5) a chord is a diameter.
6) a circle can have two different radii lengths.
7) the measure of a semicircle is 360°.
8) two minor arcs of a circle are congruent.
9) a tangent to a circle contains the diameter.
10) an inscribed right angle intercepts a semicircle.
11) if two chords are equidistant to the center of a circle, then the chords are congruent.
12) a circle can have two different chord lengths.
13) two concentric circles are similar.
14) a segment is a region bounded by an arc and a diameter.
15) a secant contains a diameter.

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