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As you learned in the last lesson, a triangle is the simplest polygon, having three sides and three angles. The sum of the three angles of a triangle is equal to 180 degrees.

Triangles are classified by sides and by angles. Move your cursor over the triangles to learn more.

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 ·  Polygon basics

 ·  Triangles

 ·  Quadrilaterals

 ·  Area of polygons
    and circles


First Glance In Depth Examples Workout
First Glance   In Depth   Examples   Workout

Triangles