10.3 Central Angles and Arcs Flashcards

1
Q

Central Angle

A

An angle whose vertex is the center of the circle

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2
Q

Arc

A

An unbroken part of a circle

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3
Q

Minor arc

A

On circle P, if angle APB is less than 180 degrees, then the points A and B together with the points on circle P that lie in the interior of angle APB

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4
Q

Measure of a Minor Arc

A

Measure of its central angle

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5
Q

Semicircle

A

If the endpoints of the arc are the endpoints of a diameter, then the arc is a semicircle and its measure is 180 degrees

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6
Q

Major Arc

A

On circle P, if the measure of angle APB is less than 180 degrees, then the points A and B together with the points on circle P that lie in the exterior of angle APB

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7
Q

Measure of a Major Arc

A

Difference between 360 degrees and the measure of its associated minor arc

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8
Q

Adjacent Arcs

A

Two arcs of the same circle that intersect at exactly one point

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9
Q

Arc Addition Postulate

A

The measure of an arc formed by two adjacent arcs is the sum of the measures of the two arcs

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10
Q

Congruent Arcs

A

In the same circle or in congruent circles, two arcs are congruent if and only if they have the same measure

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11
Q

Thm. 10.4

A

In the same circle or congruent circles, two arcs are congruent if and only if their central angles are congruent

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