Triangles classify by sides (equilateral, isosceles, scalene) and angles (acute, right, obtuse). Each type has unique properties useful in geometry proofs and real-world design.
Area Formulas
Area = 0.5 * base * height for any triangle. For a right triangle, the legs serve as base and height. Use the Triangle Calculator.
Angle Sum
Interior angles always sum to 180 degrees. In an equilateral triangle, each angle is 60 degrees.
Triangle Inequality
Any side must be less than the sum of the other two. This determines whether three lengths can form a triangle.
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