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Calculate triangle properties: area, perimeter, angles, and sides
Enter triangle parameters to calculate properties
sss
sss
asa
asa
c² = a² + b² - 2ab·cos(C)
Used when you know two sides and the included angle (SAS) or all three sides (SSS).
a/sin(A) = b/sin(B) = c/sin(C)
Used when you know two angles and one side (ASA/AAS) or two sides and a non-included angle (SSA).
Area = √[s(s-a)(s-b)(s-c)]
Where s is the semiperimeter. Used to calculate area when all three sides are known.
a + b > c, a + c > b, b + c > a
The sum of any two sides must be greater than the third side for a valid triangle.