# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 12.77   b = 6.72   c = 6.44

Area: T = 10.15498598517
Perimeter: p = 25.93
Semiperimeter: s = 12.965

Angle ∠ A = α = 152.0266248047° = 152°1'35″ = 2.65333585779 rad
Angle ∠ B = β = 14.29105221378° = 14°17'26″ = 0.24994166631 rad
Angle ∠ C = γ = 13.68332298148° = 13°41' = 0.23988174126 rad

Height: ha = 1.59896413237
Height: hb = 3.02107916225
Height: hc = 3.15221303887

Median: ma = 1.59661751157
Median: mb = 9.53985350028
Median: mc = 9.68223163551

Inradius: r = 0.78328661667
Circumradius: R = 13.61221272627

Vertex coordinates: A[6.44; 0] B[0; 0] C[12.37548524845; 3.15221303887]
Centroid: CG[6.27216174948; 1.05107101296]
Coordinates of the circumscribed circle: U[3.22; 13.22657933076]
Coordinates of the inscribed circle: I[6.245; 0.78328661667]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 27.97437519526° = 27°58'25″ = 2.65333585779 rad
∠ B' = β' = 165.7099477862° = 165°42'34″ = 0.24994166631 rad
∠ C' = γ' = 166.3176770185° = 166°19' = 0.23988174126 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    