# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 4   b = 9   c = 6

Area: T = 9.56222957495
Perimeter: p = 19
Semiperimeter: s = 9.5

Angle ∠ A = α = 20.74219164807° = 20°44'31″ = 0.36220147358 rad
Angle ∠ B = β = 127.1698899656° = 127°10'8″ = 2.22195160051 rad
Angle ∠ C = γ = 32.08991838633° = 32°5'21″ = 0.56600619127 rad

Height: ha = 4.78111478747
Height: hb = 2.1254954611
Height: hc = 3.18774319165

Median: ma = 7.38224115301
Median: mb = 2.39879157617
Median: mc = 6.2854902545

Inradius: r = 1.00765574473
Circumradius: R = 5.64771794447

Vertex coordinates: A[6; 0] B[0; 0] C[-2.41766666667; 3.18774319165]
Centroid: CG[1.19444444444; 1.06224773055]
Coordinates of the circumscribed circle: U[3; 4.78444159184]
Coordinates of the inscribed circle: I[0.5; 1.00765574473]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 159.2588083519° = 159°15'29″ = 0.36220147358 rad
∠ B' = β' = 52.8311100344° = 52°49'52″ = 2.22195160051 rad
∠ C' = γ' = 147.9110816137° = 147°54'39″ = 0.56600619127 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    