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## 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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