# 9.2: Tangent Lines

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**At Grade**Created by: CK-12Estimated7 minsto complete

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**Practice**Tangent Lines

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diameter

diameter

A chord that passes through the center of the circle. The length of a diameter is two times the length of a radius.point of tangency

point of tangency

The point where the tangent line touches the circle.Tangent

Tangent

The tangent of an angle in a right triangle is a value found by dividing the length of the side opposite the given angle by the length of the side adjacent to the given angle.Tangent to a Circle Theorem

Tangent to a Circle Theorem

A line is tangent to a circle if and only if the line is perpendicular to the radius drawn to the point of tangency.Two Tangent Theorem

Two Tangent Theorem

The Two-Tangent Theorem states that if two tangent segments are drawn to one circle from the same external point, then they are congruent.### Image Attributions

## Description

This concept teaches students about tangent lines and how to apply theorems related to tangents of circles.

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## Date Created:

Jul 17, 2012## Last Modified:

Feb 26, 2015## Vocabulary

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