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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.

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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.

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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.

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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.

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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.

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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

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