Curated OER
Lines, Rays, Line Segments, and Planes
High schoolers are introduced to lines, rays, line segments and planes and study the differences between them. They also practice graphing lines, rays, line segments and planes
Beacon Learning Center
Beacon Learning Center: The Facts Please, Mr. Mumble
This interactive web lesson teaches students about two-dimensional shape attributes.
Beacon Learning Center
Beacon Learning Center: Anglemania!
Students explore four types of angles in this interactive web lesson.
National Council of Teachers of Mathematics
The Math Forum: Geoboard Activities
Math Forum provides a set of links to sites that are related to geoboard activities. There are several great links to lessons using geoboards. The links provide insight into how to use them, including how to perform various measurements...
The Math League
The Math League: Figures and Polygons
This site provides definitions of different types of polygons and figures.
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...
Sophia Learning
Sophia: Classifying Polygons
This lesson explores the characteristics of various types of polygons. It includes two PowerPoint presentations that test students' understanding by grouping polygons in the correct categories.
Oswego City School District
Regents Exam Prep Center: Length of a Line Segment (Distance)
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.
BBC
Bbc: Angles
You can pick up some valuable pointers on angles and lines here. When you finish working your way through the pages you can take an on-line "Test Bite," and check your understanding.
Other
Desmos: Geometry Scavenger Hunt
Use the Desmos transformation tools (link at top of page) to complete this scavenger hunt. There are three levels to choose from and solutions are included.
Math Open Reference
Math Open Reference: Points and Lines
A complete reference guide to points, lines, and planes. It provides definitions and interactive activities that enhance further explanation.
Alabama Learning Exchange
Alex: Geometric Man
The learners will explore angles, rays, line segments, perpendicular lines, parallel lines, and two-dimensional figures through the use of the book Shape Up! Fun With Triangles and Other Polygons by David A. Adler. They will also...
Better Lesson
Better Lesson: Coordinate Grid and Geometry
Students make connections between the coordinate grid and Geometry by finding the distance of line segments using the coordinate plane. This lesson plan includes a detailed lesson plan, slides containing notes and problems, and a...
National Council of Teachers of Mathematics
Nctm: Illuminations: Triangle Inequality
This activity illustrates the Triangle Inequality and the conditions necessary for a triangle to be formed from three straight lines.
Shodor Education Foundation
Shodor Interactivate: Cantor's Comb
Learn about fractions between 0 and 1 by repeatedly deleting portions of a line segment, and also learn about properties of fractal objects.
Math Open Reference
Math Open Reference: Diagonals of a Rectangle
Learn about the diagonals of a rectangle with this helpful reference tool. Provides a detailed definition, examples, and interactive activities that enhance further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Congruent
Learn about congruent with this handy reference guide. Provides a detailed definition and examples that enhance further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Diagonals of a Square
A complete reference guide to diagonals of a square. It provides definitions, examples, and interactive activities that enhance further explanation. Includes links to related topics.
Other
Nearpod: Rotations Using Coordinates
In this lesson on rotations using coordinates, 8th graders explore rotations of line segments using the coordinate plane.
Wolfram Research
Wolfram Math World: Line Segment
This site contains a definition of a line segment. Includes a graphic and links to related sites.
Sophia Learning
Sophia: Measuring a Line Segment: Lesson 1
This video lesson [3:59] will walk you through using a ruler to measure the distance between endpoints. It is 1 of 10 in the series titled "Measuring a Line Segment." Students can answer review questions to assess their understanding of...
ClassFlow
Class Flow: Lines, Rays, Line Segments
[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.
Sophia Learning
Sophia: Measuring a Line Segment: Lesson 2
This video lesson [2:15] will walk you through using a ruler to measure the distance between endpoints. It is 2 of 10 in the series titled "Measuring a Line Segment." Students can take a short review quiz when finished....
Sophia Learning
Sophia: Measuring a Line Segment: Lesson 3
This video lesson [1:04] will walk you through using a ruler to measure the distance between endpoints. It is 3 of 10 in the series titled "Measuring a Line Segment." Students can answer review questions when finished....