Triangle calculator SSS - result

Please enter the triangle sides:

Right scalene triangle.

Sides: a = 39   b = 80   c = 89

Area: T = 1560
Perimeter: p = 208
Semiperimeter: s = 104

Angle ∠ A = α = 25.98992335838° = 25°59'21″ = 0.45435976961 rad
Angle ∠ B = β = 64.01107664162° = 64°39″ = 1.11771986307 rad
Angle ∠ C = γ = 90° = 1.57107963268 rad

Height: ha = 80
Height: hb = 39
Height: hc = 35.05661797753

Median: ma = 82.34222734687
Median: mb = 55.86659108939
Median: mc = 44.5

Inradius: r = 15
Circumradius: R = 44.5

Vertex coordinates: A[89; 0] B[0; 0] C[17.09898876404; 35.05661797753]
Centroid: CG[35.36332958801; 11.68553932584]
Coordinates of the circumscribed circle: U[44.5; 0]
Coordinates of the inscribed circle: I[24; 15]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 154.0110766416° = 154°39″ = 0.45435976961 rad
∠ B' = β' = 115.9899233584° = 115°59'21″ = 1.11771986307 rad
∠ C' = γ' = 90° = 1.57107963268 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     