Answer:
Sides: a = 6 b = 9 c = 14
Area: T = 18.41
Perimeter: p = 29
Semiperimeter: s = 14.5
Angle ∠ A = α = 16.991° = 16°59'29″ = 0.297 rad
Angle ∠ B = β = 25.998° = 25°59'53″ = 0.454 rad
Angle ∠ C = γ = 137.011° = 137°39″ = 2.391 rad
Height: ha = 6.137
Height: hb = 4.091
Height: hc = 2.63
Median: ma = 11.38
Median: mb = 9.785
Median: mc = 3.082
Inradius: r = 1.27
Circumradius: R = 10.266
Vertex coordinates: A[14; 0] B[0; 0] C[5.393; 2.63]
Centroid: CG[6.464; 0.877]
Coordinates of the circumscribed circle: U[7; -7.509]
Coordinates of the inscribed circle: I[5.5; 1.27]
Exterior (or external, outer) angles of the triangle:
∠ A' = α' = 163.009° = 163°31″ = 0.297 rad
∠ B' = β' = 154.002° = 154°7″ = 0.454 rad
∠ C' = γ' = 42.989° = 42°59'21″ = 2.391 rad