Triangle Calculator
Calculate area, perimeter, angles, and height of a triangle from its three sides. Automatically identifies triangle type.
Triangle Sides
Enter the length of all three sides
📐 Triangle Types
Equilateral
All sides equal, all angles 60°
Isosceles
Two sides equal, two angles equal
Scalene
All sides different lengths
Right
One angle is 90° (a² + b² = c²)
Acute
All angles less than 90°
Obtuse
One angle greater than 90°
📝 Formulas Used
Area (Heron's Formula)
s = (a + b + c) / 2
Area = √[s(s-a)(s-b)(s-c)]
Perimeter
P = a + b + c
Height
h = 2 × Area / base
Angles (Law of Cosines)
cos(A) = (b² + c² - a²) / (2bc)
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