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Question 1

Central Angle

Answer 1

An angle with its vertex at the center of the circle

Question 2

The measure of a minor arc is-

Answer 2

-the measure of its central angle

Question 3

The measure of a major arc is-

Answer 3

-found by subtracting the measure of the minor arc from 360 degrees

Question 4

Semicircles

Answer 4

The two arcs of a circle that are cut off by a diameter

Question 5

Adjacent arcs

Answer 5

Adjacent arcs of a circle are arcs that have exactly one point in common

Question 6

Arc addition postulate

Answer 6

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

Question 7

In the same circle or in congruent circles, two minor arcs are congruent if and only if-

Answer 7

-their central angles are congruent

Question 8

1 In the same circle or in congruent circles, (2)

Answer 8

1) Congruent arcs have congruent chords
2) Congruent chords have congruent arcs

Question 9

A diameter that is perpendicular to the chord-

Answer 9

-bisects the chord and its arc

Question 10

2 In the same circle or in congruent circles, (2)

Answer 10

1) Chords equally distant from the center (or centers) are congruent
2) Congruent chords are equally distant from the center (or centers)

Question 11

Inscribed angle

Answer 11

An angle whose vertex is a circle and whose sides contain chords of the circle

Question 12

The measure of an inscribed angle is equal to-

Answer 12

-half the measure of its intercepted arc

Question 13

If two inscribed angles intercept the same arc,

Answer 13

then the angles are congruent

Question 14

An angle that’s inscribed in a semicircle is-

Answer 14

-a right triangle

Question 15

If a quadrilateral is inscribed in a circle,

Answer 15

then its opp. angles are supp.

Question 16

The measures of an angle formed by a chord and a tangent is equal to-

Answer 16

-half the measure of the intercepted arc.