# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 8   b = 12   c = 15

Area: T = 47.81114787473
Perimeter: p = 35
Semiperimeter: s = 17.5

Angle ∠ A = α = 32.08991838633° = 32°5'21″ = 0.56600619127 rad
Angle ∠ B = β = 52.8311100344° = 52°49'52″ = 0.92220766485 rad
Angle ∠ C = γ = 95.08797157927° = 95°4'47″ = 1.65994540924 rad

Height: ha = 11.95328696868
Height: hb = 7.96985797912
Height: hc = 6.3754863833

Median: ma = 12.98107549857
Median: mb = 10.4166333328
Median: mc = 6.91101374805

Inradius: r = 2.73220844998
Circumradius: R = 7.53295725929

Vertex coordinates: A[15; 0] B[0; 0] C[4.83333333333; 6.3754863833]
Centroid: CG[6.61111111111; 2.1254954611]
Coordinates of the circumscribed circle: U[7.5; -0.66766809067]
Coordinates of the inscribed circle: I[5.5; 2.73220844998]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 147.9110816137° = 147°54'39″ = 0.56600619127 rad
∠ B' = β' = 127.1698899656° = 127°10'8″ = 0.92220766485 rad
∠ C' = γ' = 84.92202842073° = 84°55'13″ = 1.65994540924 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   