Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 11.18   b = 12.53   c = 21.4

Area: T = 54.50442416146
Perimeter: p = 45.11
Semiperimeter: s = 22.555

Angle ∠ A = α = 23.98772078514° = 23°59'14″ = 0.41986557554 rad
Angle ∠ B = β = 27.10549642289° = 27°6'18″ = 0.47330708694 rad
Angle ∠ C = γ = 128.908782792° = 128°54'28″ = 2.25498660288 rad

Height: ha = 9.7550311559
Height: hb = 8.76997991404
Height: hc = 5.09438543565

Median: ma = 16.6220239168
Median: mb = 15.8821623815
Median: mc = 5.14884609351

Inradius: r = 2.41765037293
Circumradius: R = 13.7550432403

Vertex coordinates: A[21.4; 0] B[0; 0] C[9.95221378505; 5.09438543565]
Centroid: CG[10.45107126168; 1.69879514522]
Coordinates of the circumscribed circle: U[10.7; -8.63662255222]
Coordinates of the inscribed circle: I[10.025; 2.41765037293]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 156.0132792149° = 156°46″ = 0.41986557554 rad
∠ B' = β' = 152.8955035771° = 152°53'42″ = 0.47330708694 rad
∠ C' = γ' = 51.09221720804° = 51°5'32″ = 2.25498660288 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     