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Activity
Texas Instruments: Triangle Sum Activity
Texas Instruments

Texas Instruments: Triangle Sum

For Teachers 9th - 10th Standards
This activity is used to discover that the sum of the measures of the triangle angles is constant and to discover ways of proving the theorem listed in the activity.
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eBook
Ck 12: Interactive Geometry: 4.4 Theorems About Triangles eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 4.4 Theorems About Triangles

For Students 9th - 10th Standards
Discover some theorems about triangles.
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