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Lesson Plan
Curated OER

Why Study Fractals?

For Teachers 9th - 12th
Pupils explore the concept of fractals. In this fractals lesson, students use the website to research where fractals occur in nature. Pupils research what fractals are and how fractals are used to solve real world problems.
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Lesson Plan
Curated OER

Pass It On

For Teachers 5th
Fifth graders participate in a class activity that helps them learn some geometric terms along with their definitions. They describe relationships between two and three-dimensional shapes and analyze attributes and properties of...
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Lesson Plan
Curated OER

Polygons Defined

For Teachers 4th
Fourth graders explore polygons. In this polygon lesson, 4th graders sort polygons according to their properties. Students discover the connection between polygons and the Greek language.
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Lesson Plan
Curated OER

Tangrams

For Teachers 4th - 11th
Students construct the tangram pieces from a square paper by following directions to fold and cut. They make observations on the pieces formed and compare how they are related to each other. They explore patterns and shapes with the...
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Lesson Plan
Curated OER

Fun Ideas for Getting A-Round in Math CIRCLES

For Teachers 6th - 8th
Students see circles in real life and have fun with them
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Unit Plan
Oswego City School District

Regents Exam Prep Center: Mean Proportional in a Right Triangle

For Teachers 9th - 10th
Material to supplement classroom instruction on mean proportional in a right triangle: a lesson with a definition of "mean proportional" as well as theorems with examples; an online multiple-choice quiz with answers; and guidelines for...
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Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Determining the Unknown Angle in a Right Triangle

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 a missing angle in a right triangle.
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Handout
CK-12 Foundation

Ck 12: Geometry: Special Right Triangles Study Guide

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Different types of right triangles and trigonometric ratios for special right triangles are covered in this study guide.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: 45 45 90 Right Triangles

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Apply the special properties of 45-45-90 right triangles.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: 30 60 90 Right Triangles

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Apply the special properties of 30-60-90 right triangles.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: 30 60 90 Right Triangles Intermediate

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept teaches students about the 30-60-90 special right triangle and how to apply its properties.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: 45 45 90 Right Triangles Intermediate

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept teaches students about the 45-45-90 special right triangle and how to apply its properties.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Recognize 45 45 90 Right Triangles

For Students 8th
[Free Registration/Login may be required to access all resource tools.] Recognize special right triangles and their properties.
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Unknown Type
Khan Academy

Khan Academy: Trigonometric Ratios in Right Triangles

For Students 9th - 10th Standards
Given the side lengths of a right triangle, find the sine, cosine, or tangent of one of the acute angles. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Handout
CK-12 Foundation

Ck 12: Geometry: Right Triangle Similarity Study Guide

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] An overview of altitudes and geometric mean is provided in this study guide.
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Activity
Maths Challenge

Maths challenge.net: Right Triangle Equal Parts

For Students 9th - 10th Standards
A geometry proof problem involving a right triangle and finding angles of equal measure.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Hl Triangle Congruence

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept introduces the HL Triangle Congruence shortcut in order to prove that two right triangles are congruent. Students work on mastering the skill by watch...
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Activity
Maths Challenge

Maths challenge.net: Right Angle Reasoning

For Students 9th - 10th Standards
A geometry problem for students to use their mathematical reasoning skills to explain a right triangle property.
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Handout
Geometry Help

Geometry Help: Right Triangles

For Students 9th - 10th Standards
Explains the basic concept of right triangles with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
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Unit Plan
CK-12 Foundation

Ck 12: Trigonometry: Lengths of Sides in Isosceles Right Triangles

For Students 10th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] Here you'll learn what an isosceles right triangle is, the relationships between the sides of an isosceles right triangle, and how to find the length of an unknown...
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Unknown Type
Khan Academy

Khan Academy: Solve for an Angle in Right Triangles

For Students 9th - 10th Standards
Given two sides in a right triangle, find one of the acute angles using trigonometry. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Unknown Type
Khan Academy

Khan Academy: Right Triangle Word Problems

For Students 9th - 10th
Solve word problems by modeling real-world (and not-so-real) situations as right triangles and using trigonometry. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Unit Plan
CK-12 Foundation

Ck 12: Trigonometry: Special Triangle Ratios

For Students 10th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] Use right triangle ratios to solve for sides of triangles.
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Unknown Type
Khan Academy

Khan Academy: Right Triangle Side Lengths

For Students 7th - 8th Standards
Use the Pythagorean Theorem to determine if the given side lengths could form a right triangle, i.e., which set forms a Pythagorean triple. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a...