Triangles English
Contents |
Triangle Basics
Grade 3 and up
Lesson Plans
Lesson Plan for Constructing Various Types of Triangles. By Amphie Vedua-Dinagsao, PhD
Grade 4 and up
InterActive Worksheets
Triangle Area Explore the areas of a dynamic triangle. By Victoria Trujillo-Cortellese
- Triangle Altitude Predict the heights of the traingles. By Victoria Trujillo-Cortellese
- Triangle HeightExplore the heights of a dynamic triangle. By Victoria Trujillo-Cortellese
- Triangle Exploration Explore the possibilities. By Victoria Trujillo-Cortellese
Grade 5 and up
InterActive Worksheets
- The sum of the angles in a triangle
Download See one explanation of why the angles in a triangle have a sum of 180°. By Duane Habecker
Triangle Geometry
InterActive Worksheets
- The Triangle Inequality An exploration of the triangle inequality and why the sum of two sides of a triangle must be greater than the third. By David Travis
- Understanding SAS 3 InterActivities for understanding the SAS side-angle-side property. By Linda Fahlberg-Stojanovska User:LFS
- Area comparisons GGB Download Using alternative sets of bases and altitudes to determine the area of a triangle, combined with shearing. By Ken Frank
- Congruent Triangles ASA Interactive sheet to show how ASA is sufficient for two triangles to be congruent. By Michael O'Loughlin
- Congruent Triangles SAS Interactive sheet to show how SAS is sufficient for two triangles to be congruent. By Michael O'Loughlin
- Congruent Triangles SSS Interactive sheet to show how SSS is sufficient for two triangles to be congruent. By Michael O'Loughlin
- Types of Triangles GGB download Creating the various types of triangles according to sides and according to angles. By Ken Frank
- AA Similarity All Math Words Encyclopedia interactive page demonstrating AA Similarity. By David McAdams
- The vocabulary of Triangles GGB download An illustration of basic triangle vocabulary. By Ken Frank
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