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 Online Scientific Calculator     A helpful scientific calculator that runs in your web browser window. Holt Online Learning Classify (2)     Trinagles can be classified according to sides and angles Math Open Reference Area of a triangle (conventional method)     The conventional method of calculating the area of a triangle (half base times altitude) with pointers to other methods and special formula for equilateral triangles Math Open Reference Classifying Triangles Worksheet     Worksheet to practice classifying triangles as scalene, isosceles, or equilateral. Helping with Math Geometry and Trigonometry Reference     A page with links for properties of circles and different types of polygons. Each link has great visuals with clear markings, definitions, and formulas. Cool Math Free Geometry Worksheets     The worksheets below can be used as part of extra math homework. These geometry worksheets are free and easily printable. They cover typical school work from grade 4 through 8. They include questions on polygons, 3D objects, angles, and calculations of area, volume, etc. Helping With Math.com Trigonometric Identities     Formulas about sin, cos, tan, csc, sec, and cot Math.com Early Edge: Triangles: Perimeter and Area     In this Early Edge video lesson, you'll learn more about Triangles: Perimeter and Area, so you can be successful when you take on high-school Math & Geometry. The Princeton Review Early Edge: Equilateral, Isoceles and Scalene Triangles     In this Early Edge video lesson, you'll learn more about Equilateral, Isoceles and Scalene Triangles, so you can be successful when you take on high-school Math & Geometry. The Princeton Review Early Edge: Triangles     In this Early Edge video lesson, you'll learn more about Triangles, so you can be successful when you take on high-school Math & Geometry. The Princeton Review