Unit 9 Test Review: Circles

Unit 9 Test Review

Circles

Multiple Select

Choose all of the sides that represent a radius. 

•  $\overline{DN}$  

•  $\overline{EF}$  

•  $\overline{DF}$  

•  $\overline{ND}$  

•  $\overline{EN}$  

Multiple Choice

Choose the side that represents a chord

• $\overline{CB}$

• $\overline{AG}$

• $\overline{AB}$

• $\overline{DB}$

Multiple Choice

Choose the side that represents a tangent

• $\overline{CB}$

• $\overline{AG}$

• $\overline{AB}$

• $\overline{DB}$

Multiple Choice

Choose the side that represents a secant

• $\overline{CB}$

• $\overline{AG}$

• $\overline{AB}$

• $\overline{DB}$

Parts of a Circle

• Radius - Half of the circle, from the center to the side of the circle

• Chord - a segment that goes from one side of the circle to the other

• Diameter - A chord that runs through the center

• Tangent - A line that touches the circle only once

• Secant - A line that cuts through the circle and touches the circle exactly twice

Multiple Choice

Find the measure of the indicated angle

• 89

• 88

• 67

• 77

Multiple Choice

Determine if AB is a tangent line or not.

• Tangent

• Not Tangent

Multiple Choice

Find the missing angle

• 35

• 32

• 34

• 46

Multiple Choice

Find the missing angle

• 39

• 82

• 64

• 90

Multiple Choice

Find the missing angle

• 51

• 45

• 70

• 52

Multiple Choice

Solve for x

• 0

• 10

• 6

• 3

Properties to Remember

• Angles that start on the side of the circle are half of the measure of the arc

• When the lines cross on the inside:  $m\angle1=\frac{x+y}{2}$  

• When the lines cross on the outside:  $m\angle1=\frac{x-y}{2}$  

Multiple Choice

Solve for x

• 15

• 12

• 13

• 9

Multiple Choice

Solve for x

• 4

• 5

• 6

• 7

Multiple Choice

Solve for x

• 19

• 24

• 26

• 21

Multiple Choice

In the equation (x-3)²+(y+4)²=121, the radius of the circle is

• 242

• 11

• 121

• 22

Multiple Choice

What is the equation of the circle?

• (x+1)² + (y +1)² = 3

• (x+1)² + (y -1)² = 3

• (x+1)² + (y +1)² = 9

• (x-1)² + (y -1)² = 9

Multiple Choice

What is the equation of a circle with radius 2 and center (3, 4)?

• (x+3)² + (y+4)² = 2

• (x-3)² + (y-4)² = 2

• (x+3)² + (y+4)² = 4

• (x-3)² + (y-4)² = 4