# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 7   b = 13   c = 19

Area: T = 28.1465825623
Perimeter: p = 39
Semiperimeter: s = 19.5

Angle ∠ A = α = 13.17435511073° = 13°10'25″ = 0.2329921841 rad
Angle ∠ B = β = 25.04396595945° = 25°2'23″ = 0.43770245035 rad
Angle ∠ C = γ = 141.7876789298° = 141°47'12″ = 2.47546463091 rad

Height: ha = 8.04216644637
Height: hb = 4.33301270189
Height: hc = 2.96327184866

Median: ma = 15.89881130956
Median: mb = 12.75773508222
Median: mc = 4.33301270189

Inradius: r = 1.4433375673
Circumradius: R = 15.35875171604

Vertex coordinates: A[19; 0] B[0; 0] C[6.34221052632; 2.96327184866]
Centroid: CG[8.44773684211; 0.98875728289]
Coordinates of the circumscribed circle: U[9.5; -12.06766206261]
Coordinates of the inscribed circle: I[6.5; 1.4433375673]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 166.8266448893° = 166°49'35″ = 0.2329921841 rad
∠ B' = β' = 154.9660340406° = 154°57'37″ = 0.43770245035 rad
∠ C' = γ' = 38.21332107017° = 38°12'48″ = 2.47546463091 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    