9.1 Parts of Circles

What kind of segments create the sides of a central angle?

• radii

• diameters

• chords

• secants

Where is the vertex of an inscribed angle?

• center of the circle

• on the circle

• anywhere inside the circle

• outside the circle

True or False: A secant can be a line, ray, or segment.

• True

• False

What are tangent circles?

How many common tangents do you predict for the last example?

(a)  

Was your previous estimate correct?

• Yes!

• No, I guessed too few

• No, I guessed too many