Circumcircle of a triangle. Definition and properties with interactive applet.
Math Open Reference
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An overview of the various centers of a triangle
Math Open Reference
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Demonstration that a triangle with fixed perimeter does not have a constant area.
Math Open Reference
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Trinagles can be classified according to sides and angles
Math Open Reference
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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
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Worksheet to practice classifying triangles as scalene, isosceles, or equilateral.
Helping with Math
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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
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In this Early Edge video lesson, you'll learn more about Complementary and Supplementary Angles, so you can be successful when you take on high-school Math & Geometry.
The Princeton Review
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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
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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
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