Geometry Unit 9 Tangent Lines

Assume that lines that appear to be tangent are tangent. O is the center of the circle. What is the value of x?

• 90

• 309

• 129

• 39

Assume that lines that appear to be tangent are tangent. O is the center of the circle. What is the value of x?

• 160

• 20

• 70

• 90

In each circle, what is the value of x to the nearest tenth?

• 4.25

• 14.10

• 3.75

• 6.25

Determine whether a tangent line is shown in the diagram. (Hint: Use the Pythagorean Theorem)

• Yes

• No

Determine whether a tangent line is shown in each diagram. (Use the Pythagorean Theorem)

• Yes

• No

Set up the difference of the two arcs in the second example problem on page 4 (2 tangent lines)

What types of lines will intersect outside of the circle to create an exterior angle? (page 4)

• 2 secant lines

• 2 tangent lines

• secant & tangent

• chords

Find the segment length indicated. Assume that lines which appear to be tangent are tangent

• 9.4

• 12.5

• 7.5

• 88.3

point "a" is called _____________

• radius

• segment

• point of tangency

• arc

What is the relationship between a radius and a tangent line?

• They are congruent

• They are perpendicular

• They are supplementary

• They do not touch