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