# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 12   b = 19   c = 23

Area: T = 113.8421995766
Perimeter: p = 54
Semiperimeter: s = 27

Angle ∠ A = α = 31.44004274006° = 31°24'2″ = 0.54880408447 rad
Angle ∠ B = β = 55.58326112896° = 55°34'57″ = 0.97700995739 rad
Angle ∠ C = γ = 93.01769613098° = 93°1'1″ = 1.62334522351 rad

Height: ha = 18.9743665961
Height: hb = 11.98333679754
Height: hc = 9.89993039797

Median: ma = 20.22437484162
Median: mb = 15.69223548265
Median: mc = 10.96658560997

Inradius: r = 4.21663702136
Circumradius: R = 11.51659611458

Vertex coordinates: A[23; 0] B[0; 0] C[6.78326086957; 9.89993039797]
Centroid: CG[9.92875362319; 3.32997679932]
Coordinates of the circumscribed circle: U[11.5; -0.60661032182]
Coordinates of the inscribed circle: I[8; 4.21663702136]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 148.6599572599° = 148°35'58″ = 0.54880408447 rad
∠ B' = β' = 124.417738871° = 124°25'3″ = 0.97700995739 rad
∠ C' = γ' = 86.98330386902° = 86°58'59″ = 1.62334522351 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    