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Activity
Math Is Fun

Math Is Fun: Triangles Contain 180 Degrees

For Students 9th - 10th Standards
Students learn about the angle-sum theorem. A definition, example, and proof are included.
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Unit Plan
Shmoop University

Shmoop: Basic Geometry: Triangles

For Students 9th - 10th Standards
The geometry resource explores triangles. Descriptions, examples, and practice exercises are included.
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Unit Plan
Shmoop University

Shmoop: Basic Geometry: Pythagorean Theorem

For Students 9th - 10th Standards
Students learn about the Pythagorean Theorem. Notes, practice problems, and examples are included in the geometry resource.
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Website
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Proving the Pythagorean Theorem

For Students 9th - 10th Standards
This Ask Dr. Math site explains how to prove the Pythagorean Theorem. Dr. Math gives three variations for proving the theorem.
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Activity
Varsity Tutors

Varsity Tutors: Hotmath: Algebra Review: Pythagorean Triples

For Students 9th - 10th Standards
Find a quick, concise explanation of Pythagorean triples. Examples are given and clearly explained.
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Activity
Math Is Fun

Math Is Fun: Pythagorean Triples

For Students 9th - 10th Standards
Students investigate the sets of whole numbers that are Pythagorean triples. A definition and examples are included.
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Handout
Varsity Tutors

Varsity Tutors: Hotmath: Algebra Review: Types of Triangles

For Students 9th - 10th Standards
Find a quick, concise explanation of the different types of triangles. Examples are given and clearly explained.
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Website
Ducksters

Ducksters: Kids Math: Triangles

For Students 1st - 9th Standards
Learn about equilateral, right angle, and isosceles triangles on this site. Learn how they work, terms, tricks and examples. .
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Lesson Plan
Michigan State University

Michigan State University: Biometrics: Hand Geometry

For Teachers 9th - 10th Standards
Students use hand geometry to prove their own identification.