# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 80   b = 90   c = 120.42

Area: T = 36009.99999172
Perimeter: p = 290.42
Semiperimeter: s = 145.21

Angle ∠ A = α = 41.63218245826° = 41°37'55″ = 0.72766124126 rad
Angle ∠ B = β = 48.36442904453° = 48°21'51″ = 0.84441161087 rad
Angle ∠ C = γ = 90.00438849722° = 90°14″ = 1.57108641324 rad

Height: ha = 909.9999997931
Height: hb = 809.9999998161
Height: hc = 59.7910732299

Median: ma = 98.49110564468
Median: mb = 91.79904581098
Median: mc = 60.20659457197

Inradius: r = 24.79216809567
Circumradius: R = 60.21100001384

Vertex coordinates: A[120.42; 0] B[0; 0] C[53.15113718651; 59.7910732299]
Centroid: CG[57.8577123955; 19.93302440997]
Coordinates of the circumscribed circle: U[60.21; -0.00440825725]
Coordinates of the inscribed circle: I[55.21; 24.79216809567]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 138.3688175417° = 138°22'5″ = 0.72766124126 rad
∠ B' = β' = 131.6365709555° = 131°38'9″ = 0.84441161087 rad
∠ C' = γ' = 89.99661150278° = 89°59'46″ = 1.57108641324 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    