Khan Academy
Khan Academy: Solve Triangles: Angle Bisector Theorem
Use the Angle Bisector Theorem to find missing side lengths in triangles. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
McGraw Hill
Glencoe: Self Check Quizzes 1 Bisectors
Use Glencoe's randomly generated self-checking quiz to test your knowledge of bisectors. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page click the "Check It" button and the...
Texas Instruments
Texas Instruments: Altitude, Median, and Angle Bisector of a Triangle
In this activity, you will construct special segments of a triangle named altitudes, medians, and angle bisectors, Using their definitions. You will look at how an altitude, a median, and an angle bisector divide the area of a triangle....
Texas Instruments
Texas Instruments: Investigating Angle Bisectors
Students will determine that any poin on the angle bisector is equidistant from the sides of the angle.
Texas Instruments
Texas Instruments: Angle Bisectors and Medians of Quadrilaterals
In this activity, students will construct angle bisectors and medians in quadrilaterals and explore the properties that appear to be true for four-sided figures. They may find it necessary to review the definitions and properties of...
Texas Instruments
Texas Instruments: How to Find the Equation of an Angle Bisector Usin
Challenge your advanced algebra or pre-calculus students to finding the equation of an angle bisector given two intersecting lines. Students can do this in several ways; the lesson plan here walks through two of them in this interesting...
Khan Academy
Khan Academy: Solve Triangles: Angle Bisector Theorem
Use the angle bisector theorem to find missing side lengths in triangles.
CK-12 Foundation
Ck 12: Geometry: Angles Study Guide
This study guide on angles covers key vocabulary, ways to name angles, how to measure them, the Protractor Postulate and the Angle Addition Postulate, types of angles, congruent angles, angle bisectors, and angle pairs. It is available...
Math Open Reference
Math Open Reference: Angles
Everything you wanted to know about angles and more, including 1) how to measure angles 2) types of angles 3) angle relationships and 4) angles around a transversal.
The Math League
The Math League: Angles and Angle Terms: Angle Bisector
A tutorial on angles with definitions, examples, and pictures.
National Council of Teachers of Mathematics
Nctm: Illuminations: Angle Bisector
This interactive demonstrates how to bisect an angle.
CK-12 Foundation
Ck 12: Angle Bisectors in Triangles
[Free Registration/Login Required] Students will use interactive triangles to explore how a line bisects an angle. Click learn more to watch a video and click challenge me to answer a practice question.
University of Georgia
University of Georgia: Inter Math: Angle Bisector
This site provides a general definition, complete with a diagram, of an angle bisector.
Math Open Reference
Math Open Reference: Angle Bisector
Learn about angle bisectors with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Texas Instruments
Texas Instruments: Bisectors
Students investigate the Perpendicular Bisector Theorem and examine its converse. They also explore the Angle Bisector Theorem.
Illustrative Mathematics
Illustrative Mathematics: G Co Angle Bisection and Midpoints of Line Segments
This task provides a construction of the angle bisector of an angle by reducing it to the bisection of an angle to finding the midpoint of a line segment. Aligns with G-CO.D.12.
Sonoma State University
Sonoma State University: Angle Bisector
This site offers an explanation with words and pictures on how to bisect an angle using a compass and straightedge.
University of Georgia
University of Georgia: Inter Math: Exterior Angles
Intermath Dictionary's site defines terms relating to angles, gives examples, and offers interactive exercises.
Varsity Tutors
Varsity Tutors: Hotmath: Graphing Calculator Practice Problems: Point, Line, Planes, Angles
Practice using your graphing calculator for drawing and labeling points, lines, planes, and angles. If you get stumped or if you would like to check your work, then select the View Solution button, which is located directly under each...
Texas Instruments
Texas Instruments: Traditional Compass Construction: Angle Bisector Using Cabri
Use Cabri Jr. and the Compass command to complete the actual construction - pencil, paper, and compass process.
CK-12 Foundation
Ck 12: Geometry: Midpoints and Segment Bisectors
[Free Registration/Login may be required to access all resource tools.] Apply the definitions of midpoint, segment bisector, and angle bisector.
Cuemath
Cuemath: Point of Concurrency
Learn all about the point of concurrency. This lesson targets the point of concurrency of perpendicular bisectors, the point of concurrency of the angle bisectors of a triangle, and has interesting solved examples and practice questions.
CK-12 Foundation
Ck 12: Geometry: Bisectors, Medians, Altitudes Study Guide
This study guide on bisectors, medians, and altitudes covers key vocabulary, different theorems, and facts about the altitude and triangles. It is available for download with free registration.
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