AnswersEAP-Geometry B CRIntroduction to Circles

Introduction to Circles Answers

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1
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Segments AC and BD are diameters of circle O.

Question illustration
A
107°
B
146°
C
253°
D
287°
2
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Circle B is shown. Line segments C B, D B, and E B are radii and they form 3 congruent angles.

Question illustration
A
a minor arc
B
a major arc
C
a semicircle
D
a chord
3

Circle B is shown. Line segments C B, D B, and E B are radii. Angle C B E is 52 degrees and angle E B D is 160 degrees.

Question illustration
A
106°
B
108°
C
148°
D
212°
4

In circle O, SU is a diameter.

Question illustration
A
100°
B
108°
C
130°
D
160°
5

In circle O, and are diameters. Arc ED measures 17°.

Question illustration
A
107°
B
180°
C
253°
D
270°
6

Circle D is shown. Line segment F E goes through point D. Line segment C D is shown. Line segment G H goes from one side of the circle to the other side. Line segment A B is outside of the circle and intersects the circle at point B.

Question illustration
A
EF
B
DC
C
Line segment A B
Option C
D
Line G H
Option D
7

Circle X with a radius of 6 units and circle Y with a radius of 2 units are shown.

Question illustration
A
Translate the circles so they share a common center point, and dilate circle Y by a scale factor of 4.
B
Translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle Y by a scale factor of 4.
C
Translate the circles so they share a common center point, and dilate circle Y by a scale factor of 3.
D
Translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle Y by a scale factor of 3.
8

Which is true regarding chords and diameters of circles?

A
Both chords and diameters have two endpoints on a circle. Diameters must intersect the center of a circle.
B
Both chords and diameters have two endpoints on a circle. Chords must intersect the center of a circle.
C
Chords have two endpoints on a circle. Diameters have one endpoint on a circle and one at the center.
D
Chords have one endpoint on a circle and one at the center. Diameters have two endpoints on a circle.
9

Circle D is shown. Line segment F E goes through point D. Line segment C D is shown. Line segment G H goes from one side of the circle to the other side. Line segment A B is outside of the circle and intersects the circle at point B.

Question illustration
A
Line G H
Option A
B
Line segment A B
Option B
C
CD
D
EF
10

In circle O, AC and BD are diameters.

Question illustration
A
50°
B
80°
C
100°
D
130°

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