Standard #: MAFS.912.G-C.1.4 (Archived Standard)


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Construct a tangent line from a point outside a given circle to the circle.


General Information

Subject Area: Mathematics
Grade: 912
Domain-Subdomain: Geometry: Circles
Cluster: Level 2: Basic Application of Skills & Concepts
Cluster: Understand and apply theorems about circles. (Geometry - Additional Cluster) -

Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters.

Date Adopted or Revised: 02/14
Content Complexity Rating: Level 2: Basic Application of Skills & Concepts - More Information
Date of Last Rating: 02/14
Status: State Board Approved - Archived

Related Courses

Course Number1111 Course Title222
1206320: Geometry Honors (Specifically in versions: 2014 - 2015, 2015 - 2022, 2022 - 2024, 2024 and beyond (current))


Related Resources

Formative Assessments

Name Description
Using a Compass To Construct a Tangent Line

Students are asked to construct a tangent line to a given circle from a given exterior point.

Constructing a Tangent Line

Students are asked to complete and justify the construction of a line tangent to a circle from an exterior point.

Lesson Plan

Name Description
Off on a Tangent

Students learn and apply vocabulary, notation, concepts, and geometric construction techniques associated with circles and their tangents to a historical real-world scenario, the Mason-Dixon Line, and a hypothetical real-world scenario, the North-South Florida Line.

Problem-Solving Task

Name Description
Tangent to a circle from a point

This problem solving task challenges students to describe and compare different angles.

Tutorial

Name Description
Constructing Tangent Lines

This GeoGebraTube interactive worksheet shows you the step by step method for constructing tangent lines to a circle from a point outside the circle.  Use the slider to see each step, and read below the illustration to follow the steps.  

Student Resources

Problem-Solving Task

Name Description
Tangent to a circle from a point:

This problem solving task challenges students to describe and compare different angles.

Tutorial

Name Description
Constructing Tangent Lines:

This GeoGebraTube interactive worksheet shows you the step by step method for constructing tangent lines to a circle from a point outside the circle.  Use the slider to see each step, and read below the illustration to follow the steps.  



Parent Resources

Problem-Solving Task

Name Description
Tangent to a circle from a point:

This problem solving task challenges students to describe and compare different angles.



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