Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 4   b = 25   c = 28

Area: T = 34.9566222622
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 5.73219679652° = 5°43'55″ = 0.11000417136 rad
Angle ∠ B = β = 38.62548328731° = 38°37'29″ = 0.67441305067 rad
Angle ∠ C = γ = 135.6433199162° = 135°38'36″ = 2.36774204333 rad

Height: ha = 17.4788111311
Height: hb = 2.79664978098
Height: hc = 2.49768730444

Median: ma = 26.46769605357
Median: mb = 15.6122494996
Median: mc = 11.15879568022

Inradius: r = 1.22765341271
Circumradius: R = 20.02550469729

Vertex coordinates: A[28; 0] B[0; 0] C[3.125; 2.49768730444]
Centroid: CG[10.375; 0.83222910148]
Coordinates of the circumscribed circle: U[14; -14.31879085856]
Coordinates of the inscribed circle: I[3.5; 1.22765341271]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 174.2688032035° = 174°16'5″ = 0.11000417136 rad
∠ B' = β' = 141.3755167127° = 141°22'31″ = 0.67441305067 rad
∠ C' = γ' = 44.35768008383° = 44°21'24″ = 2.36774204333 rad

How did we calculate this triangle?

1. The triangle circumference is the sum of the lengths of its three sides 2. Semiperimeter of the triangle 3. The triangle area using Heron's formula 4. Calculate the heights of the triangle from its area. 5. Calculation of the inner angles of the triangle using a Law of Cosines     