Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 9   b = 19   c = 25

Area: T = 72.2330101066
Perimeter: p = 53
Semiperimeter: s = 26.5

Angle ∠ A = α = 17.70656342953° = 17°42'20″ = 0.30990216146 rad
Angle ∠ B = β = 39.94545051898° = 39°56'40″ = 0.69771631336 rad
Angle ∠ C = γ = 122.3549860515° = 122°20'59″ = 2.13554079053 rad

Height: ha = 16.05111335702
Height: hb = 7.60331685333
Height: hc = 5.77884080853

Median: ma = 21.74328149052
Median: mb = 16.21095650774
Median: mc = 8.04767384697

Inradius: r = 2.72656641912
Circumradius: R = 14.79664627521

Vertex coordinates: A[25; 0] B[0; 0] C[6.9; 5.77884080853]
Centroid: CG[10.63333333333; 1.92661360284]
Coordinates of the circumscribed circle: U[12.5; -7.91774055077]
Coordinates of the inscribed circle: I[7.5; 2.72656641912]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 162.2944365705° = 162°17'40″ = 0.30990216146 rad
∠ B' = β' = 140.055549481° = 140°3'20″ = 0.69771631336 rad
∠ C' = γ' = 57.65501394851° = 57°39'1″ = 2.13554079053 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     