Triangles English

Contents 1 Triangle Basics 1.1 Grade 3 and up 1.1.1 Lesson Plans 1.2 Grade 4 and up 1.2.1 InterActive Worksheets 1.3 Grade 5 and up 1.3.1 InterActive Worksheets 2 Triangle Geometry 2.1 InterActive Worksheets

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 Area Comparisons 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
• AA Similarity All Math Words Encyclopedia interactive page demonstrating AA Similarity. By David McAdams

back to English