Geometry 9-3 Central Angle: An angle with its vertex at the

Central Angle:

____________________________________________ An angle with its vertex at the __________ of a circle

Geometry 9-3

Minor Arc:

An unbroken part of a circle (__________ than half); named by 2 endpoints. Its measure equals the measure of its __________ __________.

Major Arc:

An unbroken part of a circle (__________ than half); named by 3 points.

Semicircle:

An unbroken half of the circle; its measure equals __________ degrees.

Adjacent Arcs:

Arcs with exactly __________ point in common.

Arc Addition Postulate:

The measure of the arc formed by 2 __________ arcs is the sum of the measures of these 2 arcs.

Theorem:

In the same circle (or in congruent circles), 2 minor arcs are congruent iff their __________ angles are __________.