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Lesson Plan
Curated OER

Proposed Problems

For Teachers 6th - 8th
In this math worksheet, pupils find the solutions to the problems that involve solving equations with and without rational expressions.
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Lesson Plan
Curated OER

The Distance to an Unapproachable Point

For Teachers 8th - 11th
Students use geometry or trigonometry to measure the distance of a far off point. They verify their measurements using a tape measure to check their work.
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Lesson Plan
Curated OER

Hidden Jewels of Geometry

For Teachers 5th - 8th
Students identify different geometric shapes, and arrange them artistically in original jewelry designs.
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Worksheet
Curated OER

Completing Precalculus Computations

For Students 12th
In this precalculus worksheet, 12th graders find the solutions to four problems. They verify the identity of sine and find the exact value of cosine.
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Worksheet
Curated OER

Math Vocabulary Fill-In Puzzle

For Students 4th - 6th
In this math vocabulary puzzle, students use a set of definition clues given to solve a crossword puzzle. A reference web site is given for additional activities.
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Worksheet
Curated OER

Math Vocabulary Review

For Students 5th - 6th
In this math vocabulary instructional activity, students read a set of 15 math related definitions and write the words being defined. A reference web site is included for additional activities. 
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Interactive
Sophia Learning

Sophia: Sum of Angles in Polygons

For Students 6th - 8th
This tutorial with video and slideshow components investigate the characteristics of polygons as well as how to calculate the interior and exterior angles of any polygon. It offers two PowerPoint presentations and two videos that feature...
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: A ced.a.1: Sum of Angles in a Polygon

For Teachers 9th - 10th
This problem provides students with an opportunity to discover algebraic structure in a geometric context. They will divide up polygons into triangles. The will use the sum of the angles of 180 degrees for each triangle. Aligns with...
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Activity
Government of Alberta

Learn Alberta: Math Interactives: Exploring Angles Within a Triangle

For Students 6th - 8th
This multimedia Learn Alberta math resource looks at angles of a triangle in the context of building bikes and choosing bike sizes. The accompanying interactive component lets students explore build different sized triangles while...
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Unit Plan
Texas Education Agency

Texas Gateway: Geometric Properties of Angle Relationships in Polygons

For Students 9th - 10th Standards
Given numerical and/or geometric patterns that represent geometric properties of angle relationships in polygons, the student will investigate patterns to make conjectures about interior and exterior angles of polygons.
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Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Determining Unknown Angles in Parallelograms

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch a video and attempt practice problems on how to determine missing angles in a parallelogram.
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Activity
Texas Instruments

Texas Instruments: Investigating the Angle Sum Theorem of Polygons

For Teachers 9th - 10th
This activity will allow students to use Cabri Jr. to find the sum of the measures of interior angles of convex polygons and visually see how the Interior Angle Sum Theorem works.
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Unit Plan
CK-12 Foundation

Ck 12: Triangle Sum Theorem

For Students 6th - 9th
[Free Registration/Login Required] Students explore the concept of the triangle sum theorem by navigating through the interactive learning module and then answering questions that go along with the module. Students can also learn more...
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Unit Plan
Oswego City School District

Regents Exam Prep Center: Polygons: Interior and Exterior Angles

For Students 9th - 10th
A great resource where you can learn how to calculate the measures of the interior and exterior angles of any regular polygon with these tutorials. There are several practice pages for someone to try. The teacher resource page includes...
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Lesson Plan
Oswego City School District

Regents Exam Prep Center: Angles and Triangles

For Teachers 9th - 10th Standards
On this site a viewer can learn about the different types of triangles, and categorized by either angles or sides. Tutorials are also included for interior and exterior angles of triangles. A teacher resource page includes a lesson plan...
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Activity
Math Is Fun

Math Is Fun: Angles on a Straight Line

For Students 3rd - 8th Standards
This very basic website gives a clear, simple explanation of the sum of angles on a straight line that when put together form a straight angle.
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Unknown Type
Khan Academy

Khan Academy: Using the Trig Angle Addition Identities

For Students 9th - 10th Standards
Find the trig values of sums of angles whose individual trig values are known. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Interactive
Walter Fendt

Walter Fendt: Sum of Angles in a Triangle

For Students 9th - 10th
A short interactive activity to show that the sum of the angles of a triangle is 180 degrees.
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Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Determining Unknown Angles in Trapezoids

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch a video overview and attempt practice problems on finding the missing angles in a trapezoid.
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Unit Plan
Cuemath

Cuemath: Angle Sum Theorem

For Students 9th - 10th
Explore the world of the angle sum theorem in this mini-lesson. Provides a definition and solved examples that help with understanding their properties. Includes practice questions with answers.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Sum Theorem Grade 8

For Students 8th
[Free Registration/Login may be required to access all resource tools.] Finding and understanding the angle measures of triangles.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Exterior Angles Theorems

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept teaches students the sum of exterior angles for any polygon and the relationship between exterior angles and remote interior angles in a triangle....
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Exterior Angles Theorems

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson students apply the Exterior Angles Theorems. Students examine guided notes, review guided practice, watch instructional videos and attempt practice...
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Sum Theorem Grades 9 10

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept teaches students the Triangle Sum Theorem, and how to use it.

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