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Lesson Plan
Curated OER

Exploring Characteristics of Triangles

For Teachers 9th - 11th
Students draw triangles and explore the classification of each using the measures of interior angles and lengths of sides. They investigate the sum of the interior angles of various triangles and conjecture and prove the theorem: The...
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Unit Plan
Other

George W. Hart: Polygons

For Students 9th - 10th Standards
This personal site presents some general information about polygons.