Circles True or False
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1.
A circle divides a plane into ___ regions, including the circle itself. -> 1
True
False
2.
In the following figure, points
A
,
B
, and
C
are on ⊙
O
. Which of the following angles are central angles of ⊙
O
?
-> ∠
OBC
only
True
False
3.
The radius of ⊙
P
is 3 cm. What is the exact circumference of ⊙
P
? -> 6π cm
True
False
4.
Suppose arc
AB
and arc
CD
are congruent. Which of the following is a true statement? -> Arc
AB
and arc
CD
have the same length, the same measure, and the same radius.
True
False
5.
Arc
ST
has measure 60° and radius 6 cm. What is the exact length of arc
ST
? -> 2π cm
True
False
6.
In the figure below, points
A
,
B
, and
C
are on ⊙
O
. If m∠
AOB
= 30° and ∠
BOC
is a right angle, what is the measure of arc
ABC
?
-> 30°
True
False
7.
In the figure below, points
A
,
B
,
C
, and
D
are points on ⊙
O
and lines
AC
and
BD
intersect at
O
. m∠
AOB
= 24°. Distance
OB
is 5 km. What is the exact measure of arc
BC
?
-> 156°
True
False
8.
Suppose arc
LM
and arc
PQ
have the same length. Which of the following must be true? -> Arc
LM
and arc
PQ
are congruent.
True
False
9.
The circumference of ⊙
O
is exactly 56 m. Which of the following is closest to the radius of ⊙
O
? -> 9 m
True
False
10.
A semicircle always _____. -> is an arc with measure 180°
True
False
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