CK-12 Geometry-Concepts

http://www.ck12.org Chapter 9. Circles

2. Are the blue arcs congruent? Explain why or why not.

a)

b)

3. Find the value ofxfor

⊙

Cbelow.

Answers:

1.^6 ACD∼=^6 ECBbecause they are vertical angles.^6 DCB∼=^6 ACEbecause they are also vertical angles.

AD̂∼=EB̂andAÊ∼=DB̂

2. a)AD̂∼=BĈbecause they have the same central angle measure and are in the same circle.