Triangle

A triangle is a fundamental two-dimensional polygon with three edges and three vertices. The sum of the interior angles of a triangle in planar geometry is always exactly 180 degrees.

Example

In a right-angled triangle with sides of lengths $a$, $b$, and hypotenuse $c$, the Pythagorean theorem states that $a^2 + b^2 = c^2$.

See Also

• Polygon
• Right Angled Triangle