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National Council of Teachers of Mathematics

The Math Forum: Lines and Slope: Chameleon Graphing

For Students 6th - 8th Standards
Join Joan the chameleon in an exploration of lines and slope. You'll be drawing lines, calculating slope, using equations and more!
Unknown Type
Khan Academy

Khan Academy: Draw Rays, Lines, & Line Segments

For Students 6th - 8th Standards
Draw rays, lines, and line segments with given points.
Unit Plan
Cuemath

Cuemath: Lines

For Students 3rd - 8th Standards
Learn all about lines. This lesson targets what is a line and the different types. Check-out the interactive simulations to know more about the lesson and try your hand at solving a few interesting practice questions at the end of the page.
Unit Plan
Texas Education Agency

Texas Gateway: Making and Verifying Conjectures About Lines

For Students 9th - 10th
Students will investigate patterns and make conjectures about geometric relationships.
Lesson Plan
Shodor Education Foundation

Shodor Interactivate: Lesson: Lines, Rays, Line Segments, & Planes

For Teachers 3rd - 8th Standards
This robust lesson plan for upper elementary and middle school grades introduces the concepts for lines, rays, line segments, and planes. Resources are linked to it and ready for your use.
Unit Plan
CPALMS

Cpalms: Measure Up! Measuring to Make a Line Plot

For Teachers 3rd Standards
[Free Registration/Login Required] In this lesson, students will generate measurement data by measuring lengths using rulers marked with halves and fourths of an inch and show the data by making a line plot. This lesson includes an...
Handout
Geometry Help

Geometry Help: Lines and Angles

For Students 9th - 10th Standards
Explains the basic concept of lines and angles with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
Whiteboard
ClassFlow

Class Flow: Lines, Rays, Line Segments

For Teachers 6th - 8th Standards
[Free Registration/Login Required] This lesson is an introduction to the basic geometric figures: lines, rays, and line segments. The definition and naming conventions for each figure are explained. An assessment section follows.
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Oswego City School District

Regents Exam Prep Center: Length of a Line Segment (Distance)

For Students 9th - 10th Standards
Use the coordinate plane and Pythagorean theorem to determine the length of a line segment. Click on the "Topic Index" to find a related practice exercise and teacher resource.
Handout
Math Open Reference

Math Open Reference: Points and Lines

For Students 9th - 10th Standards
A complete reference guide to points, lines, and planes. It provides definitions and interactive activities that enhance further explanation.
Unit Plan
Texas Education Agency

Texas Gateway: Coordinate Geometry: Special Segments

For Students 9th - 10th Standards
The student will derive and use the slope and midpoint formulas to verify geometric relationship that include parallelism and perpendicularity of lines. Then, the student will determine an equation of a line parallel or perpendicular to...
Lesson Plan
Better Lesson

Better Lesson: Coordinate Grid and Geometry

For Teachers 6th - 7th Standards
Students make connections between the coordinate grid and Geometry by finding the distance of line segments using the coordinate plane. This activity includes a detailed lesson plan, slides containing notes and problems, and a...
Unit Plan
Khan Academy

Khan Academy: Draw Parallel and Perpendicular Lines

For Students 3rd - 5th Standards
Practice drawing parallel and perpendicular lines, line segments, and ray. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Activity
TeachEngineering

Teach Engineering: Parallel and Intersecting Lines: A Collision Course?

For Teachers 3rd - 5th
Students act as civil engineers developing safe railways as a way to strengthen their understanding of parallel and intersecting lines. Using pieces of yarn to visually represent line segments, students lay down "train tracks" on a...
Whiteboard
ClassFlow

Class Flow: Line, Ray, Line Segment

For Teachers 3rd - 5th Standards
[Free Registration/Login Required] This flipchart describes the differences between a line, ray, and line segment.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Basic Geometric Definitions

For Students 6th - 8th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson students identify points, rays, lines, and line segments. Students examine guided notes, review guided practice, watch instructional videos and...
Activity
Other

Git: What Is the Slope Intercept Form of a Line?

For Students 9th - 10th
Not only does this site show what the slope-intercept form is, but it helps you find the slope and the intercept of a line. There is also additional information on parallel lines, parametric form, and the distance between two points.
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Houghton Mifflin Harcourt

Holt, Rinehart and Winston: Homework Help Independent Practice: Points, Lines, Planes and Angles

For Students 5th - 8th Standards
Get independent practice identifying points, lines, rays, planes and angles. Each incorrect response gets a text box explanation and another try. Correct responses are confirmed.
Handout
Math Open Reference

Math Open Reference: Line Segment

For Students 9th - 10th Standards
Learn about line segments with this useful reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Handout
Math Open Reference

Math Open Reference: Congruent Line Segments

For Students 9th - 10th Standards
Learn about congruent line segments with this helpful reference tool. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Angle Bisection and Midpoints of Line Segments

For Teachers 9th - 10th Standards
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.
Activity
Texas Instruments

Texas Instruments: Perpendicular Bisector of a Line Segment

For Teachers 9th - 10th Standards
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.
Activity
Government of Alberta

Learn Alberta: Slope of a Line Segment

For Students 9th - 10th
This interactive Java applet allows visualization of line segments and their slopes. The slope and how it is found is given for each line drawn by the user.
Activity
Oswego City School District

Regents Exam Prep Center: Bisect a Line Segment and an Angle

For Students 3rd - 8th Standards
This step-by-step tutorial teaches students how to construct a bisector of a segment and the bisector of an angle.

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