1. EXAMPLE 1
Identify special segments and lines
Tell whether the line, ray, or segment is best described as a radius, chord, diameter, secant, or tangent of C. AC a.
SOLUTION
is a radius because C is the center and A is a point on the circle. AC a.

2. EXAMPLE 1
Identify special segments and lines
Tell whether the line, ray, or segment is best described as a radius, chord, diameter, secant, or tangent of C. b. AB
SOLUTION b. AB
is a diameter because it is a chord that contains the center C.

3. EXAMPLE 1
Identify special segments and lines
Tell whether the line, ray, or segment is best described as a radius, chord, diameter, secant, or tangent of C. DE c.
SOLUTION c. DE
is a tangent ray because it is contained in a line that intersects the circle at only one point.

4. EXAMPLE 1
Identify special segments and lines
Tell whether the line, ray, or segment is best described as a radius, chord, diameter, secant, or tangent of C. AE d.
SOLUTION d. AE
is a secant because it is a line that intersects the circle in two points.

5. GUIDED PRACTICE
for Example 1
1. In Example 1, what word best describes
AG ? CB ?
SOLUTION
Is a chord because it is a segment whose endpoints are on the circle. AG CB
is a radius because C is the center and B is a point on the circle.

6. GUIDED PRACTICE
for Example 1
2. In Example 1, name a tangent and a tangent segment.
SOLUTION
A tangent is DE
A tangent segment is DB