Circles Parts and Terms

The diameter of the circle is best represented by...

•  $\overline{AB}$  

•  $\overline{CD}$  

•  $\overrightarrow{CB}$  

•  $\overleftarrow{A}\overrightarrow{B}$  

The radius of the circle is best represented by...

•  $\overline{AB}$  

•  $\overline{CD}$  

•  $\overrightarrow{CB}$  

•  $\overleftarrow{A}\overrightarrow{B}$  

The chord of the circle is best represented by...

•  $\overline{EF}$  

•  $\overline{CD}$  

•  $\overrightarrow{CB}$  

•  $\overleftarrow{A}\overrightarrow{B}$  

The Point of Tangency of the circle is best represented by...

• Point C

• Point G

• Point D

• Point E

The Tangent of the circle is best represented by...

•  $\overleftarrow{G}\overrightarrow{H}$  

•  $\overline{EF}$  

•  $\overleftarrow{E}\overrightarrow{F}$  
  

•  $\overline{AB}$  
  

The Secant of the circle is best represented by...

•  $\overleftarrow{E}\overrightarrow{F}$  

•  $\overline{EF}$  

•  $\overleftarrow{G}\overrightarrow{H}$  
  

•  $\overline{AB}$  
  

If $\overleftarrow{G}\overrightarrow{H}$ is a tangent, then  $\overline{CG}$  is ___________ to  $\overleftarrow{G}\overrightarrow{H}$ , a radius of circle C. 

• perpendicular

• parallel

• secant

• diameter

If $\overleftarrow{A}\overrightarrow{D}\ and\ \overleftarrow{B}\overrightarrow{D}$  are tangent to circle C, and  $\overline{AD}=13\ and\ \overline{BD}=4x-3$  find the value of x.

• 4

• 2.5

• 4.5

• Not enough information

In the diagram, $\overline{AC}$  is a radius of circle A. Is  $\overline{CB}$  tangent to circle A? Explain.

•  $\overline{CB}$  is not a tangent because  $13^2+27^2\ne30^2$  

•  $\overline{CB}$  is a tangent because  $13^2+27^2\approx30^2$   

•  $\overline{CB}$  is a tangent because  $13^2+27^2=30^2$ 

•  $\overline{CB}$  is not a tangent because  $13^2+27^2=30^2$  

How many common tangents are there with two circles touching at one point?

• 3

• 2

• 1

• 4

• 0