# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 43   b = 80   c = 56

Area: T = 1150.859921706
Perimeter: p = 179
Semiperimeter: s = 89.5

Angle ∠ A = α = 30.91657052964° = 30°54'57″ = 0.5439580848 rad
Angle ∠ B = β = 107.0866330888° = 107°5'11″ = 1.86990090579 rad
Angle ∠ C = γ = 41.99879638158° = 41°59'53″ = 0.73330027477 rad

Height: ha = 53.52883356774
Height: hb = 28.77114804266
Height: hc = 41.10221148951

Median: ma = 65.61882139349
Median: mb = 29.87547384926
Median: mc = 57.79770587487

Inradius: r = 12.85987622018
Circumradius: R = 41.8476995085

Vertex coordinates: A[56; 0] B[0; 0] C[-12.63439285714; 41.10221148951]
Centroid: CG[14.45553571429; 13.7010704965]
Coordinates of the circumscribed circle: U[28; 31.09993729462]
Coordinates of the inscribed circle: I[9.5; 12.85987622018]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 149.0844294704° = 149°5'3″ = 0.5439580848 rad
∠ B' = β' = 72.91436691122° = 72°54'49″ = 1.86990090579 rad
∠ C' = γ' = 138.0022036184° = 138°7″ = 0.73330027477 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   