a) If a quadrilateral is inscribed in a circle, then its opposite angles are _____________________.
b) If inscribed angles of a circle intercept the same arc or are subtended by the same chord or arc, then the angles are _____________________.
c) The measure of an inscribed angle is _____________________ the measure of its intercepted arc.
d) An inscribed angle subtends a semicircle if and only if the angle is a _____________________.
