# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 16   b = 19   c = 19

Area: T = 137.8769503517
Perimeter: p = 54
Semiperimeter: s = 27

Angle ∠ A = α = 49.80221247407° = 49°48'8″ = 0.86992110512 rad
Angle ∠ B = β = 65.09989376296° = 65°5'56″ = 1.13661908012 rad
Angle ∠ C = γ = 65.09989376296° = 65°5'56″ = 1.13661908012 rad

Height: ha = 17.23436879396
Height: hb = 14.51325793176
Height: hc = 14.51325793176

Median: ma = 17.23436879396
Median: mb = 14.77332867027
Median: mc = 14.77332867027

Inradius: r = 5.1066277908
Circumradius: R = 10.47436723

Vertex coordinates: A[19; 0] B[0; 0] C[6.73768421053; 14.51325793176]
Centroid: CG[8.57989473684; 4.83875264392]
Coordinates of the circumscribed circle: U[9.5; 4.41099672842]
Coordinates of the inscribed circle: I[8; 5.1066277908]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 130.1987875259° = 130°11'52″ = 0.86992110512 rad
∠ B' = β' = 114.901106237° = 114°54'4″ = 1.13661908012 rad
∠ C' = γ' = 114.901106237° = 114°54'4″ = 1.13661908012 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    