A triangle is a shape, or a part of two dimensional space.
It has three straight sides and three vertices. The three angles of a triangle always add up to 180° (180 degrees). It is the polygon with the least possible number of sides. A triangle with vertices A, B, C is written as . The study of geometry related to triangles is called trigonometry. Modern computers usually use triangles to make more complex graphic images or shapes.
Triangles can be grouped according to how many of their sides are equal:
Triangles can also be grouped by their angles:
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The area of a triangle is equal to base times height times one half.
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