Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 11   b = 22   c = 28

Area: T = 112.4210805459
Perimeter: p = 61
Semiperimeter: s = 30.5

Angle ∠ A = α = 21.40877436432° = 21°24'28″ = 0.3743635612 rad
Angle ∠ B = β = 46.88768325263° = 46°53'13″ = 0.81883296034 rad
Angle ∠ C = γ = 111.705542383° = 111°42'20″ = 1.95496274382 rad

Height: ha = 20.44401464471
Height: hb = 10.22200732235
Height: hc = 8.03300575328

Median: ma = 24.57113247506
Median: mb = 18.2077141456
Median: mc = 10.32198837203

Inradius: r = 3.68659280478
Circumradius: R = 15.06883851898

Vertex coordinates: A[28; 0] B[0; 0] C[7.51878571429; 8.03300575328]
Centroid: CG[11.83992857143; 2.67766858443]
Coordinates of the circumscribed circle: U[14; -5.5732811878]
Coordinates of the inscribed circle: I[8.5; 3.68659280478]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 158.5922256357° = 158°35'32″ = 0.3743635612 rad
∠ B' = β' = 133.1133167474° = 133°6'47″ = 0.81883296034 rad
∠ C' = γ' = 68.29545761695° = 68°17'40″ = 1.95496274382 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     