# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute scalene triangle.

Sides: a = 138.3   b = 132.15   c = 125

Area: T = 7485.59663016
Perimeter: p = 395.45
Semiperimeter: s = 197.725

Angle ∠ A = α = 65.00109918314° = 65°4″ = 1.13444813245 rad
Angle ∠ B = β = 59.99985313733° = 59°59'55″ = 1.04771719188 rad
Angle ∠ C = γ = 555.0004767953° = 55°2″ = 0.96599394102 rad

Height: ha = 108.2521573414
Height: hb = 113.2899387841
Height: hc = 119.7769540826

Median: ma = 108.4555468972
Median: mb = 114.0621559585
Median: mc = 119.9544183962

Inradius: r = 37.85986233486
Circumradius: R = 76.29879672211

Vertex coordinates: A[125; 0] B[0; 0] C[69.153307; 119.7769540826]
Centroid: CG[64.718769; 39.92331802752]
Coordinates of the circumscribed circle: U[62.5; 43.76221960381]
Coordinates of the inscribed circle: I[65.575; 37.85986233486]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 114.9999008169° = 114°59'56″ = 1.13444813245 rad
∠ B' = β' = 120.0011468627° = 120°5″ = 1.04771719188 rad
∠ C' = γ' = 1254.999523205° = 124°59'58″ = 0.96599394102 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    