# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 3   b = 16.26   c = 18.93

Area: T = 11.99901281705
Perimeter: p = 38.19
Semiperimeter: s = 19.095

Angle ∠ A = α = 4.46883338839° = 4°28'6″ = 0.07879871384 rad
Angle ∠ B = β = 24.97774766513° = 24°58'39″ = 0.43659392064 rad
Angle ∠ C = γ = 150.5544189465° = 150°33'15″ = 2.62876663088 rad

Height: ha = 7.99334187803
Height: hb = 1.4754800513
Height: hc = 1.26767858606

Median: ma = 17.5821702136
Median: mb = 10.8433225996
Median: mc = 6.86334958294

Inradius: r = 0.62879197785
Circumradius: R = 19.25334513992

Vertex coordinates: A[18.93; 0] B[0; 0] C[2.71994215531; 1.26767858606]
Centroid: CG[7.2166473851; 0.42222619535]
Coordinates of the circumscribed circle: U[9.465; -16.76663104403]
Coordinates of the inscribed circle: I[2.835; 0.62879197785]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 175.5321666116° = 175°31'54″ = 0.07879871384 rad
∠ B' = β' = 155.0232523349° = 155°1'21″ = 0.43659392064 rad
∠ C' = γ' = 29.44658105352° = 29°26'45″ = 2.62876663088 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    