# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse isosceles triangle.

Sides: a = 8.6   b = 12.17   c = 8.6

Area: T = 36.98799698458
Perimeter: p = 29.37
Semiperimeter: s = 14.685

Angle ∠ A = α = 44.96334154418° = 44°57'48″ = 0.78547596424 rad
Angle ∠ B = β = 90.07331691164° = 90°4'23″ = 1.57220733688 rad
Angle ∠ C = γ = 44.96334154418° = 44°57'48″ = 0.78547596424 rad

Height: ha = 8.65999929874
Height: hb = 6.07772341571
Height: hc = 8.65999929874

Median: ma = 9.62200025988
Median: mb = 6.07772341571
Median: mc = 9.62200025988

Inradius: r = 2.51882138131
Circumradius: R = 6.08550049618

Vertex coordinates: A[8.6; 0] B[0; 0] C[-0.01109825581; 8.65999929874]
Centroid: CG[2.8633005814; 2.86766643291]
Coordinates of the circumscribed circle: U[4.3; 4.30554947898]
Coordinates of the inscribed circle: I[2.515; 2.51882138131]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 135.0376584558° = 135°2'12″ = 0.78547596424 rad
∠ B' = β' = 89.92768308836° = 89°55'37″ = 1.57220733688 rad
∠ C' = γ' = 135.0376584558° = 135°2'12″ = 0.78547596424 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    