# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 20.4   b = 17.7   c = 29.02

Area: T = 178.3287548232
Perimeter: p = 67.12
Semiperimeter: s = 33.56

Angle ∠ A = α = 43.97553566589° = 43°58'31″ = 0.76875147634 rad
Angle ∠ B = β = 37.04655532937° = 37°2'44″ = 0.64765668782 rad
Angle ∠ C = γ = 98.97990900474° = 98°58'45″ = 1.7287511012 rad

Height: ha = 17.48330929639
Height: hb = 20.15500054499
Height: hc = 12.29899757568

Median: ma = 21.76443102349
Median: mb = 23.47699318278
Median: mc = 12.41771212445

Inradius: r = 5.31436933323
Circumradius: R = 14.69900208408

Vertex coordinates: A[29.02; 0] B[0; 0] C[16.2822398346; 12.29899757568]
Centroid: CG[15.10107994487; 4.09766585856]
Coordinates of the circumscribed circle: U[14.51; -2.2932730316]
Coordinates of the inscribed circle: I[15.86; 5.31436933323]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 136.0254643341° = 136°1'29″ = 0.76875147634 rad
∠ B' = β' = 142.9544446706° = 142°57'16″ = 0.64765668782 rad
∠ C' = γ' = 81.02109099526° = 81°1'15″ = 1.7287511012 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    