Which one of the following statements is NOT true about angles and arcs formed on a circle and inside a circle? A) Inscribed angles subtended by the same arc or congruent arc are equal.

B) An inscribed angle subtended by a semi circle is right angle.

C)The opposite angles of a cyclic quadrilateral arc supplementary.

D)The measure of a central angle is equal to half of the measure of its intercepted arc.