Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 5   b = 6   c = 9

Area: T = 14.14221356237
Perimeter: p = 20
Semiperimeter: s = 10

Angle ∠ A = α = 31.58663380965° = 31°35'11″ = 0.55112855984 rad
Angle ∠ B = β = 38.9422441269° = 38°56'33″ = 0.68796738189 rad
Angle ∠ C = γ = 109.4711220634° = 109°28'16″ = 1.91106332362 rad

Height: ha = 5.65768542495
Height: hb = 4.71440452079
Height: hc = 3.14326968053

Median: ma = 7.22884161474
Median: mb = 6.63332495807
Median: mc = 3.20215621187

Inradius: r = 1.41442135624
Circumradius: R = 4.7732970773

Vertex coordinates: A[9; 0] B[0; 0] C[3.88988888889; 3.14326968053]
Centroid: CG[4.29662962963; 1.04875656018]
Coordinates of the circumscribed circle: U[4.5; -1.59109902577]
Coordinates of the inscribed circle: I[4; 1.41442135624]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 148.4143661903° = 148°24'49″ = 0.55112855984 rad
∠ B' = β' = 141.0587558731° = 141°3'27″ = 0.68796738189 rad
∠ C' = γ' = 70.52987793655° = 70°31'44″ = 1.91106332362 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    