# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 15   b = 16   c = 26

Area: T = 109.6511436379
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 31.81444665509° = 31°48'52″ = 0.55552671911 rad
Angle ∠ B = β = 34.21660511313° = 34°12'58″ = 0.59771827493 rad
Angle ∠ C = γ = 113.9699482318° = 113°58'10″ = 1.98991427132 rad

Height: ha = 14.62201915172
Height: hb = 13.70664295474
Height: hc = 8.43547258753

Median: ma = 20.242228248
Median: mb = 19.66596032513
Median: mc = 8.45657672626

Inradius: r = 3.84774188203
Circumradius: R = 14.22768998156

Vertex coordinates: A[26; 0] B[0; 0] C[12.40438461538; 8.43547258753]
Centroid: CG[12.80112820513; 2.81215752918]
Coordinates of the circumscribed circle: U[13; -5.78796780501]
Coordinates of the inscribed circle: I[12.5; 3.84774188203]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 148.1865533449° = 148°11'8″ = 0.55552671911 rad
∠ B' = β' = 145.7843948869° = 145°47'2″ = 0.59771827493 rad
∠ C' = γ' = 66.03105176822° = 66°1'50″ = 1.98991427132 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    