Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 5   b = 14   c = 18

Area: T = 23.70552209439
Perimeter: p = 37
Semiperimeter: s = 18.5

Angle ∠ A = α = 10.84440625637° = 10°50'39″ = 0.1899264596 rad
Angle ∠ B = β = 31.78883306171° = 31°47'18″ = 0.5554811033 rad
Angle ∠ C = γ = 137.3687606819° = 137°22'3″ = 2.39875170246 rad

Height: ha = 9.48220883776
Height: hb = 3.38664601348
Height: hc = 2.63439134382

Median: ma = 15.93295323221
Median: mb = 11.20326782512
Median: mc = 5.43113902456

Inradius: r = 1.28113632943
Circumradius: R = 13.28882119405

Vertex coordinates: A[18; 0] B[0; 0] C[4.25; 2.63439134382]
Centroid: CG[7.41766666667; 0.87879711461]
Coordinates of the circumscribed circle: U[9; -9.77663273563]
Coordinates of the inscribed circle: I[4.5; 1.28113632943]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 169.1565937436° = 169°9'21″ = 0.1899264596 rad
∠ B' = β' = 148.2121669383° = 148°12'42″ = 0.5554811033 rad
∠ C' = γ' = 42.63223931807° = 42°37'57″ = 2.39875170246 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     