Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 4   b = 26   c = 28

Area: T = 46.63768952654
Perimeter: p = 58
Semiperimeter: s = 29

Angle ∠ A = α = 7.36111606635° = 7°21'40″ = 0.12884764903 rad
Angle ∠ B = β = 56.38876254015° = 56°23'15″ = 0.98441497206 rad
Angle ∠ C = γ = 116.2511213935° = 116°15'4″ = 2.02989664426 rad

Height: ha = 23.31884476327
Height: hb = 3.5877453482
Height: hc = 3.33112068047

Median: ma = 26.94443871706
Median: mb = 15.19986841536
Median: mc = 12.24774487139

Inradius: r = 1.60881688023
Circumradius: R = 15.61099585072

Vertex coordinates: A[28; 0] B[0; 0] C[2.21442857143; 3.33112068047]
Centroid: CG[10.07114285714; 1.11104022682]
Coordinates of the circumscribed circle: U[14; -6.90444047244]
Coordinates of the inscribed circle: I[3; 1.60881688023]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 172.6398839336° = 172°38'20″ = 0.12884764903 rad
∠ B' = β' = 123.6122374598° = 123°36'45″ = 0.98441497206 rad
∠ C' = γ' = 63.7498786065° = 63°44'56″ = 2.02989664426 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     