# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 84   b = 78.81   c = 115.19

Area: T = 3310.021997207
Perimeter: p = 278
Semiperimeter: s = 139

Angle ∠ A = α = 46.82218778193° = 46°49'19″ = 0.81771959299 rad
Angle ∠ B = β = 43.17106789673° = 43°10'14″ = 0.75334704883 rad
Angle ∠ C = γ = 90.00774432134° = 90°27″ = 1.57109262354 rad

Height: ha = 78.8109999335
Height: hb = 843.9999992912
Height: hc = 57.47106132836

Median: ma = 89.3087760581
Median: mb = 92.78880058251
Median: mc = 57.58875335902

Inradius: r = 23.81330933242
Circumradius: R = 57.5955000486

Vertex coordinates: A[115.19; 0] B[0; 0] C[61.26327832277; 57.47106132836]
Centroid: CG[58.81875944092; 19.15768710945]
Coordinates of the circumscribed circle: U[57.595; -0.00774820848]
Coordinates of the inscribed circle: I[60.19; 23.81330933242]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 133.1788122181° = 133°10'41″ = 0.81771959299 rad
∠ B' = β' = 136.8299321033° = 136°49'46″ = 0.75334704883 rad
∠ C' = γ' = 89.99325567866° = 89°59'33″ = 1.57109262354 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    