# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 11   b = 16   c = 20

Area: T = 87.81219439484
Perimeter: p = 47
Semiperimeter: s = 23.5

Angle ∠ A = α = 33.28664163383° = 33°17'11″ = 0.58109575613 rad
Angle ∠ B = β = 52.9677156255° = 52°58'2″ = 0.92444512721 rad
Angle ∠ C = γ = 93.74664274067° = 93°44'47″ = 1.63661838202 rad

Height: ha = 15.96658079906
Height: hb = 10.97664929936
Height: hc = 8.78111943948

Median: ma = 17.25554339267
Median: mb = 14.01878457689
Median: mc = 9.40774438611

Inradius: r = 3.73766784659
Circumradius: R = 10.02114157714

Vertex coordinates: A[20; 0] B[0; 0] C[6.625; 8.78111943948]
Centroid: CG[8.875; 2.92770647983]
Coordinates of the circumscribed circle: U[10; -0.65548084169]
Coordinates of the inscribed circle: I[7.5; 3.73766784659]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 146.7143583662° = 146°42'49″ = 0.58109575613 rad
∠ B' = β' = 127.0332843745° = 127°1'58″ = 0.92444512721 rad
∠ C' = γ' = 86.25435725933° = 86°15'13″ = 1.63661838202 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    