Triangle Calculator
Calculate sides, angles, area, perimeter, heights, medians, and more for any triangle
Triangle Input
Triangle Type
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Area
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Perimeter
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Sides
a:—
b:—
c:—
Angles
A:—
B:—
C:—
Height (a)
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Height (b)
—
Height (c)
—
Median
—
Inradius (r)
—
Circumradius (R)
—
Semiperimeter
—
Angle Sum
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Step-by-Step Solution
Enter triangle values and click Calculate to see the solution steps.
Triangle Reference
Law of Sines
a/sin(A) = b/sin(B) = c/sin(C)
Law of Cosines
c² = a² + b² - 2ab·cos(C)
Area (Heron's)
A = √(s(s-a)(s-b)(s-c))
Area (Base × Height)
A = ½ × base × height
Angle Sum
A + B + C = 180°
Pythagorean (Right)
a² + b² = c²