Solve two problems that apply properties of tangents to determine if a line is tangent to a circle.

Solve two problems that apply properties of tangents to determine if a line is tangent to a circle.

[Free Registration/Login may be required to access all resource tools.] Define the tangent and cotangent graphs using the unit circle.

[Free Registration/Login may be required to access all resource tools.] This study guide reviews the terminology for circles (tangent, arcs, central angles) and the equation for a circle.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to calculate angles formed outside a circle by tangent and secant lines.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to find angles on and inside a circle created by chords and tangent lines.

This site has many useful formulas and examples relating to circles, including related definitions, circumference of a circle, area of a circle, length of a circular arc, area of a circular sector, equation of a circle in cartesian...

Rather than dividing a circle into some number of segments (like 360 degrees), mathematicians often prefer to measure angles using the circumference of a unit circle - a circle with radius 1. This way of measuring angles is called...

Explains the basic concept of circles with step-by-step instructions and methods for solving specific problems on your own relating to this topic.

Provides advanced information about circles through the use of examples and a brief video lesson. [1:00]

[Free Registration/Login may be required to access all resource tools.] Name the parts of a circle.

[Free Registration/Login may be required to access all resource tools.] Solve problems containing angles on or inside a circle.

This resource provides two levels of multiple choice questions to review the parts of a circle as well as area and perimeter.

This study guide on circles covers some vocabulary and theorems about segments and lengths. It is available for download with free registration.

Given examples of circles and the lines that intersect them, the student will use explorations and concrete models to formulate and test conjectures about the properties and relationships among the resulting segments.

Students use the drawing and measurement tools of Cabri Jr. to draw a line tangent to a circle. [Requires Adobe Reader.]

Very good site presenting a Trig problem dealing with tangents lines and circles, then linking the student to the solution

In this task, students are shown a circle with center O and point P on the circle. L is a line that is a tangent to the circle at P. They must show that line OP is perpendicular to line L. Aligns with G-C.A.2, G-CO.A, and G-CO.C.9.

This task builds on a previous one called ''Right triangles inscribed in circles I.'' Here learners are asked to construct a tangent line to a circle from a point outside of the circle. Aligns with G-C.A.4.

Determine the rules for radius and tangents of circles.

This activity is designed to help students discover several important theorems concerning lengths of segments formed by intersecting chords, secants, and tangents.

Solve problems related to tangents of circles.

Generalize that a tangent and a radius form a 90-degree angle.

Two hands-on lab activities for instructors to use when teaching about the coordinate graphs of the sine, cosine, and tangent functions derived from a unit circle. The graphs of the reciprocals of the three functions are investigated....