10.2 Find Arc Measures
§ Central Angle
§ Minor Arc § Major Arc
§ Semicircle
§ Adjacent Arcs
Measuring Arcs
àMeasure of a minor arc = __________________________________________
àMeasure of a major arc = _________________________________________
Example 1: Find measures of arcs
àArc Addition Postulate
The measure of an arc formed by two adjacent arcs is
the sum of the measures of the two arcs.
Example 2: Find measures of arcs
Example 3: Identify the given arc as major arc, minor arc, or semicircle, and find the
measure of the arc.
1.)

TQ
2.)

QRT
3.)

TQR
4.)

QS
5.)

TS
6.)

RST
§ Congruent Circles
§ Congruent Arcs
Example 4: Identify congruent arcs
Tell whether the shaded arcs are congruent. Explain why or why not.