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Activity
Rice University

Rice University: Cynthia Lanius: Hidden Polygon Activity

For Students 4th - 7th Standards
On this site students are instructed to locate different types of polygons on triangle grid paper. This page can be printed so that students can actually draw them. It also gives a definitions link for each polygon.
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Unit Plan
Varsity Tutors

Varsity Tutors: Hotmath: Review: Area

For Students 9th - 10th Standards
Find a quick, concise explanation of area and the formulas for different shapes. An example is given to help you understand how find the area of a shape. The area formulas are listed for different types of shapes.
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Handout
Math Open Reference

Math Open Reference: Full Angle

For Students 9th - 10th Standards
Explore full angles triangles with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
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Handout
Math Open Reference

Math Open Reference: Reflex Angle

For Students 9th - 10th Standards
Explore reflex angles triangles with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
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Activity
PBS

Pbs Teachers: Architecture: Community Geometry

For Teachers 3rd - 8th Standards
Identify architectural structures and objects in the community that represent different figures and types of geometry and mathematics.
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Activity
Analyze Math

Analyze Math: Sine Law Ambiguous Case Applet

For Students 9th - 10th Standards
Learn how the ambiguous case of the law of sines arises from the ASS situation and how to solve problems of this type. Definitely use the applet to visualize the two distinct outcomes that are possible and to understand the circumstances...
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Unit Plan
Enchanted Learning

Enchanted Learning: World Flags

For Students 6th - 8th
Enchanted Learning features this website devoted to the study of the world's flags. There are fact sheets, illustrations, current and historical flags, and related links.
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Lesson Plan
Science Education Resource Center at Carleton College

Serc: Investigating Soils

For Teachers 6th - 8th
In this guided inquiry middle schoolers will specify soil types by using various methods of determining soil textures and analyze them with a soil triangle. This activity is a laboratory investigation where students gather data on soil...
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Activity
Analyze Math

Analyze Math: Reflection Across a Line

For Students 9th - 10th Standards
Reflect any point, line segment, triangle, or any other figure over one or two lines using this dynamic applet. Points and lines are entered by point-and-click rather than by typing equations or ordered pairs. A very neat exercise to...
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Srt Similar Quadrilaterals

For Teachers 9th - 10th Standards
The goal of this task is to study if the analog of the AA criterion for similarity of triangles holds for different types of quadrilaterals. Aligns with HSG-SRT.A.2.
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Lesson Plan
Better Lesson

Better Lesson: Tri, Tri, Tri Angle!

For Teachers K Standards
Kindergarteners love to identify shapes in their environment. In order effectively do that, they must be able to recognize different shapes by their specific attributes. In this lesson kindergartners learn about different types of...
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Handout
CK-12 Foundation

Ck 12: Geometry: Polygons Study Guide

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This study guide focuses on polygons: convex vs concave, interior and exterior angles, and basic terminology for common polygons.
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Whiteboard
ClassFlow

Class Flow: Dissection Puzzles

For Teachers 9th - 10th
[Free Registration/Login Required] If you like tangrams, you'll enjoy this flipchart. Dissect and arrange in different shapes all types of squares, triangles, and polygons.

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