Lesson Plan
Science Buddies

Science Buddies: Circles, Tangent Lines and Triangles

For Teachers 9th - 10th Standards
Here is a project that combines Computer Science and Mathematics. The semicircle has two tangent lines that meet at point T. You need to prove that a line drawn from A to T bisects CD. You'll also learn how to create an interactive...
eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 8.7 Tangent Lines to Circles

For Students 9th - 10th Standards
When a line intersects a circle in exactly one point the line is said to be tangent to the circle or a tangent of the circle.
Unit Plan
Khan Academy

Khan Academy: Determining Tangent Lines: Lengths

For Students 9th - 10th Standards
Solve two problems that apply properties of tangents to determine if a line is tangent to a circle.
Unit Plan
Khan Academy

Khan Academy: Determining Tangent Lines: Angles

For Students 9th - 10th Standards
Solve two problems that apply properties of tangents to determine if a line is tangent to a circle.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G C Tangent to a Circle From a Point

For Teachers 9th - 10th Standards
This task builds on a previous one called ''Right triangles inscribed in circles I.'' Here students are asked to construct a tangent line to a circle from a point outside of the circle. Aligns with G-C.A.4.
Handout
Johan Claeys

Math Abundance: The Parabola

For Students 9th - 10th Standards
Defines parabolas, their properties, gives parametric equations, tangent line in a point D of a parabola, etc.
Unit Plan
Oswego City School District

Regents Exam Prep Center: Circles, Segments, and Area

For Students 9th - 10th Standards
A wealth of resources to supplement instruction on parts of the circle. Find lessons describing chords, tangents, secants, and segments, as well as related practice quizzes and classroom activities.
Study Guide
Department of Defense

Do Dea: Normal Line to a Curve

For Students 9th - 10th
The tangent to a curve is always found at a certain point along the curve. Often you will be asked to find the normal to a curve at a point. View an example on this site.

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