Interactive
Curated OER

My Test Book: Geometry skills

For Students 3rd - 4th
In this online interactive math skills worksheet, students solve 10 multiple choice math problems regarding geometry skills. Students may view the correct answers.
Worksheet
Curated OER

Shape Definitions

For Students 4th - 6th
In this shapes definitions instructional activity, learners match a set of descriptions with their correct shape names, 10 total, then answer a set of 4 additional questions. Answers included on page 2.
Lesson Plan
Curated OER

Math is Beautiful

For Teachers 4th - 7th
Students explore how geometry is used on the composition of artworks by artists from different cultures. This lesson is equally suited for a Math or Art classroom at the late-elementary or early-middle school level.
Handout
The Math League

The Math League: Figures and Polygons

For Students 9th - 10th Standards
This site provides definitions of different types of polygons and figures.
Unknown Type
Khan Academy

Khan Academy: Classify Shapes by Line and Angle Types

For Students 3rd - 5th Standards
Classify shapes based on pictures or attributes, such as angle types and side-lengths. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
eBook
Math Planet

Math Planet: Geometry: Polygons

For Students 9th - 10th Standards
A definition, examples, and a video lesson all help to explain polygons. [0:43]
Handout
Math Open Reference

Math Open Reference: Congruent

For Students 9th - 10th Standards
Learn about congruent with this handy reference guide. Provides a detailed definition and examples that enhance further explanation. Includes links to related topics.
Interactive
Math Open Reference

Math Open Reference: Congruence

For Students 9th - 10th Standards
A complete reference guide to congruence including congruent triangles and polygons. It provides definitions, animation, and interactive activities that enhance further explanation.
Activity
Math Open Reference

Math Open Reference: Constructions

For Students 9th - 10th Standards
Learn about drawing shapes using only a compass and straight edge or ruler with out measuring any lengths or angles.
Lesson Plan
Alabama Learning Exchange

Alex: Geometric Man

For Teachers 3rd - 5th Standards
The students 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...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Gpe.5 Triangles Inscribed in Circle

For Teachers 9th - 10th Standards
In this task, students use ideas about linear functions to determine when certain angles are right angles. They use the fact that two lines (if not vertical or horizontal) are perpendicular when their slopes are inverse reciprocals, as...
Interactive
Math Slice

Math Slice: Math Match Game

For Students 9th - 10th Standards
Test your geometry aptitude using this interactive matching game. Match pictures and symbols to the correct definition. Answers are verified immediately. Winners can earn as much as 10,000 dollars and have their name posted for the day.
Lesson Plan
Beacon Learning Center

Beacon Learning Center: Quad Squad

For Teachers 2nd - 4th Standards
This interactive lesson investigates quadrilaterals and provides students with an opportunity to practice describing their attributes.
Whiteboard
ClassFlow

Class Flow: Blast Off With Geometry

For Teachers 3rd - 8th Standards
[Free Registration/Login Required] Learn about polygons, angles, parallel, intersecting and perpendicular lines as you journey into space. Included is an activote quiz.
Website
Other

Antonio Gutierrez: Geometry From the Land of the Incas

For Students 9th - 10th
Discovering the properties of constructions, seeing proofs in action, and viewing problems come to life here with this wonderful use of technology in the classroom. Single steps are explained and illustrated one at a time so that the...
Interactive
CK-12 Foundation

Ck 12: Isosceles Triangles

For Students 7th - 9th Standards
[Free Registration/Login Required] Students are given an Isosceles triangle and are asked to move the point on the line segment to explore how the angle measure changes. Click learn more to watch a video demonstration and click challenge...