# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 6   b = 12   c = 15

Area: T = 34.19770393455
Perimeter: p = 33
Semiperimeter: s = 16.5

Angle ∠ A = α = 22.33216450092° = 22°19'54″ = 0.39897607328 rad
Angle ∠ B = β = 49.45883981265° = 49°27'30″ = 0.86332118901 rad
Angle ∠ C = γ = 108.2109956864° = 108°12'36″ = 1.88986200307 rad

Height: ha = 11.39990131152
Height: hb = 5.76995065576
Height: hc = 4.56596052461

Median: ma = 13.24876412995
Median: mb = 9.72111110476
Median: mc = 5.80994750193

Inradius: r = 2.07325478391
Circumradius: R = 7.89554203395

Vertex coordinates: A[15; 0] B[0; 0] C[3.9; 4.56596052461]
Centroid: CG[6.3; 1.52198684154]
Coordinates of the circumscribed circle: U[7.5; -2.46773188561]
Coordinates of the inscribed circle: I[4.5; 2.07325478391]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 157.6688354991° = 157°40'6″ = 0.39897607328 rad
∠ B' = β' = 130.5421601874° = 130°32'30″ = 0.86332118901 rad
∠ C' = γ' = 71.79900431357° = 71°47'24″ = 1.88986200307 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    