# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 12.2   b = 11.7   c = 0.8

Area: T = 3.72992953423
Perimeter: p = 24.7
Semiperimeter: s = 12.35

Angle ∠ A = α = 127.1698899656° = 127°10'8″ = 2.22195160051 rad
Angle ∠ B = β = 49.83658609182° = 49°50'9″ = 0.87697998586 rad
Angle ∠ C = γ = 2.99552394258° = 2°59'43″ = 0.05222767899 rad

Height: ha = 0.61113598922
Height: hb = 0.63774863833
Height: hc = 9.32332383557

Median: ma = 5.61773837327
Median: mb = 6.3655335812
Median: mc = 11.94659198055

Inradius: r = 0.30219672342
Circumradius: R = 7.65550654694

Vertex coordinates: A[0.8; 0] B[0; 0] C[7.869875; 9.32332383557]
Centroid: CG[2.89895833333; 3.10877461186]
Coordinates of the circumscribed circle: U[0.4; 7.64546077297]
Coordinates of the inscribed circle: I[0.65; 0.30219672342]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 52.8311100344° = 52°49'52″ = 2.22195160051 rad
∠ B' = β' = 130.1644139082° = 130°9'51″ = 0.87697998586 rad
∠ C' = γ' = 177.0054760574° = 177°17″ = 0.05222767899 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    