18.8 11.6 13.8 triangle

Obtuse scalene triangle.

Sides: a = 18.8   b = 11.6   c = 13.8

Area: T = 79.72435818312
Perimeter: p = 44.2
Semiperimeter: s = 22.1

Angle ∠ A = α = 95.09663350634° = 95°5'47″ = 1.66597441534 rad
Angle ∠ B = β = 37.92215566245° = 37°55'18″ = 0.66218560206 rad
Angle ∠ C = γ = 46.98221083121° = 46°58'56″ = 0.82199924796 rad

Height: ha = 8.48112321097
Height: hb = 13.74554451433
Height: hc = 11.55441422944

Median: ma = 8.61104587567
Median: mb = 15.43769686143
Median: mc = 14.01439216496

Inradius: r = 3.60774018928
Circumradius: R = 9.43773080426

Vertex coordinates: A[13.8; 0] B[0; 0] C[14.83304347826; 11.55441422944]
Centroid: CG[9.54334782609; 3.85113807648]
Coordinates of the circumscribed circle: U[6.9; 6.43883835775]
Coordinates of the inscribed circle: I[10.5; 3.60774018928]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 84.90436649366° = 84°54'13″ = 1.66597441534 rad
∠ B' = β' = 142.0788443375° = 142°4'42″ = 0.66218560206 rad
∠ C' = γ' = 133.0187891688° = 133°1'4″ = 0.82199924796 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     