Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 16   b = 18   c = 26

Area: T = 141.9865914794
Perimeter: p = 60
Semiperimeter: s = 30

Angle ∠ A = α = 37.35768519729° = 37°21'25″ = 0.65220000651 rad
Angle ∠ B = β = 43.04990798002° = 43°2'57″ = 0.75113481825 rad
Angle ∠ C = γ = 99.59440682269° = 99°35'39″ = 1.7388244406 rad

Height: ha = 17.74882393493
Height: hb = 15.77662127549
Height: hc = 10.92219934457

Median: ma = 20.88106130178
Median: mb = 19.62114168703
Median: mc = 11

Inradius: r = 4.73328638265
Circumradius: R = 13.18444063738

Vertex coordinates: A[26; 0] B[0; 0] C[11.69223076923; 10.92219934457]
Centroid: CG[12.56441025641; 3.64106644819]
Coordinates of the circumscribed circle: U[13; -2.19774010623]
Coordinates of the inscribed circle: I[12; 4.73328638265]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 142.6433148027° = 142°38'35″ = 0.65220000651 rad
∠ B' = β' = 136.95109202° = 136°57'3″ = 0.75113481825 rad
∠ C' = γ' = 80.40659317731° = 80°24'21″ = 1.7388244406 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     