Illustrative Mathematics
Illustrative Mathematics: g.co Bisecting an Angle
In this task, students practice bisecting an angle. Includes a GeoGebra worksheet that teachers can use to demonstrate the task. 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.
Oswego City School District
Regents Exam Prep Center: Bisect a Line Segment and an Angle
This step-by-step tutorial teaches students how to construct a bisector of a segment and the bisector of an angle.
CK-12 Foundation
Ck 12: Geometry: Arcs and Angles Study Guide
This study guide on arcs and angles covers key vocabulary, arc measurement in degrees and radians, congruent arcs, bisecting arcs, and the angles on, inside, and outside a circle. Also covers formulas and theorems. It is available for...
CK-12 Foundation
Ck 12: Geometry: Lines and Angles Study Guide
This study guide on lines and angles covers key terminology; line notation; parallel, perpendicular, and skew lines; and postulates and theorems about lines. It is available for download with free registration.
National Council of Teachers of Mathematics
Nctm: Illuminations: Angle Bisector
This interactive demonstrates how to bisect an angle.
ClassFlow
Class Flow: Bisecting Angles
[Free Registration/Login Required] Sunshine State Standard: MA.C.3.3.1-1 You can bisect an angle by using a compass and a straight edge. This flipchart goes over definitions and the mathematical process of bisecting angles in a step by...
Texas Instruments
Texas Instruments: Perpendicular Bisector of a Line Segment
Students learn to draw a segment and its perpendicular bisector. They understand right angles and congruent segments. Students observe that changing the length or orientation of the segment changes the perpendicular bisector.
Wolfram Research
Wolfram Math World: Angle Bisector
MathWorld offers a definition for an interior angle bisector accompanied by an example this site also gives a formula for the lenght of the bisector of a triangle.
CK-12 Foundation
Ck 12: Congruent Angles and Angle Bisectors
[Free Registration/Login Required] Students explore the concept of congruent angles and angle bisectors by navigating through the interactive learning module and then answering questions that go along with the module. Students can also...
CK-12 Foundation
Ck 12: Congruent Angles and Angle Bisectors
[Free Registration/Login Required] Students explore congruent angles and angle bisectors through the interactive learning module and then answering questions that go along with the module. Students can also learn more about the concept...
CK-12 Foundation
Ck 12: Interactive Geometry: 5.2 Bisectors of Line Segments and Angles
Learn how to construct bisectors of line segments and angles.
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.
The Math League
The Math League: Angles and Angle Terms: Angle Bisector
A tutorial on angles with definitions, examples, and pictures.
Oswego City School District
Regents Exam Prep Center: Geometric Constructions
Learn all about the basic geometric constructions in this test prep lesson. You will explore line segments and points, and understand key terms like the terms parallel and perpendicular. Construction activities and interactive online...
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.
Math Is Fun
Math Is Fun: Definition of Bisector
A clear definition and drawing of a bisector, a line that divides one angle into two.
Other
Advogato: Trigonometry by Geometric Construction
This site from Advogato is all about angles. It contains information starting with what an angle is and what it looks like, all the way up to bisecting angles and theorems about angles. This is very good information for students just...
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.
Texas Instruments
Texas Instruments: Inscribing a Circle in a Triangle
In this activity, students bisect the angles of a triangle and find the incenter of the triangle. They find the distance from the incenter to the side of the triangle and use it as radius. With the incenter as the center, they inscribe a...
Texas Instruments
Texas Instruments: Triangle Properties Assessment
This activity uses Cabri Jr. to assess the students' knowledge of various segments related to triangles: perpendicular bisector, median, angle bisector, midsegment, and altitude.
Oswego City School District
Regents Exam Prep Center: Geometry Vocabulary Resources
A list of geometry definitions and a matching activity.
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...