# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 7   b = 10.71   c = 15.09

Area: T = 33.89882775964
Perimeter: p = 32.8
Semiperimeter: s = 16.4

Angle ∠ A = α = 24.80328385821° = 24°48'10″ = 0.43328911971 rad
Angle ∠ B = β = 39.92884507217° = 39°55'42″ = 0.69768829303 rad
Angle ∠ C = γ = 115.2698710696° = 115°16'7″ = 2.01218185262 rad

Height: ha = 9.68552221704
Height: hb = 6.33302105689
Height: hc = 4.49328134654

Median: ma = 12.60877793445
Median: mb = 10.47327276772
Median: mc = 4.99224968703

Inradius: r = 2.06769681461
Circumradius: R = 8.34333243532

Vertex coordinates: A[15.09; 0] B[0; 0] C[5.36879257787; 4.49328134654]
Centroid: CG[6.81993085929; 1.49876044885]
Coordinates of the circumscribed circle: U[7.545; -3.56114654655]
Coordinates of the inscribed circle: I[5.69; 2.06769681461]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 155.1977161418° = 155°11'50″ = 0.43328911971 rad
∠ B' = β' = 140.0721549278° = 140°4'18″ = 0.69768829303 rad
∠ C' = γ' = 64.73112893039° = 64°43'53″ = 2.01218185262 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    