# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute scalene triangle.

Sides: a = 75.9   b = 80   c = 56

Area: T = 2031.464407278
Perimeter: p = 211.9
Semiperimeter: s = 105.95

Angle ∠ A = α = 65.08108994062° = 65°4'51″ = 1.13658759748 rad
Angle ∠ B = β = 72.92195182918° = 72°55'10″ = 1.27326856832 rad
Angle ∠ C = γ = 421.999582302° = 41°59'58″ = 0.73330309956 rad

Height: ha = 53.5330015093
Height: hb = 50.78766018195
Height: hc = 72.55222883136

Median: ma = 57.68770652746
Median: mb = 53.37704506258
Median: mc = 72.77664041431

Inradius: r = 19.17437996487
Circumradius: R = 41.84656822048

Vertex coordinates: A[56; 0] B[0; 0] C[22.29329464286; 72.55222883136]
Centroid: CG[26.09876488095; 24.18440961045]
Coordinates of the circumscribed circle: U[28; 31.09876063257]
Coordinates of the inscribed circle: I[25.95; 19.17437996487]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 114.9199100594° = 114°55'9″ = 1.13658759748 rad
∠ B' = β' = 107.0880481708° = 107°4'50″ = 1.27326856832 rad
∠ C' = γ' = 1388.000417698° = 138°2″ = 0.73330309956 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   