Triangle calculator

Please enter what you know about the triangle:
You have entered side a, b and c.

Obtuse scalene triangle.

Sides: a = 1.6   b = 2.6   c = 4.1

Area: T = 0.9065617883
Perimeter: p = 8.3
Semiperimeter: s = 4.15

Angle ∠ A = α = 9.78325599442° = 9°46'57″ = 0.17107378803 rad
Angle ∠ B = β = 16.02877573234° = 16°1'40″ = 0.2879737137 rad
Angle ∠ C = γ = 154.1989682732° = 154°11'23″ = 2.69111176363 rad

Height: ha = 1.13220223537
Height: hb = 0.69766291408
Height: hc = 0.4421764821

Median: ma = 3.33884127965
Median: mb = 2.82875431031
Median: mc = 0.67663874629

Inradius: r = 0.21882211766
Circumradius: R = 4.70883875883

Vertex coordinates: A[4.1; 0] B[0; 0] C[1.5387804878; 0.4421764821]
Centroid: CG[1.87992682927; 0.14772549403]
Coordinates of the circumscribed circle: U[2.05; -4.23986806534]
Coordinates of the inscribed circle: I[1.55; 0.21882211766]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 170.2177440056° = 170°13'3″ = 0.17107378803 rad
∠ B' = β' = 163.9722242677° = 163°58'20″ = 0.2879737137 rad
∠ C' = γ' = 25.81103172677° = 25°48'37″ = 2.69111176363 rad

How did we calculate this triangle?

1. Input data entered: side a, b and c. 2. The triangle circumference is the sum of the lengths of its three sides 3. Semiperimeter of the triangle 4. The triangle area using Heron's formula 5. Calculate the heights of the triangle from its area. 6. Calculation of the inner angles of the triangle using a Law of Cosines     