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Section 9.3 Arcs and Central Angles Name Period # Definition 1: A ____________________ angle is an angle with its vertex at the center of the circle. Definition 2: An _____________ is an unbroken part of a circle. Definition 3: If Y and Z are the endpoints of a diameter, then the two arcs are called __________________. Use 3 letters to name a semicircle or major arc. _______________ arcs can be named with 2. The measure of a minor arc is defined to be the measure of its _____________________ angle. The measure of a major arc is __________ minus the measure of its _____________ arc. Definition 4: ________________________ arcs of a circle are arcs that have exactly one point in common. The following postulate can be used to find the measure of an arc formed by 2 adjacent arcs: Definition 5: ________________________ arcs are arcs, in the same circle or in congruent circles that have equal measures. Ex 1: Name the congruent arcs in the figures below: