# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 20.78   b = 41.57   c = 36

Area: T = 374.0439994503
Perimeter: p = 98.35
Semiperimeter: s = 49.175

Angle ∠ A = α = 29.99220422353° = 29°59'31″ = 0.52334598864 rad
Angle ∠ B = β = 90.01098227245° = 90°35″ = 1.57109677657 rad
Angle ∠ C = γ = 59.99881350402° = 59°59'53″ = 1.04771650015 rad

Height: ha = 365.999999471
Height: hb = 17.99656696898
Height: hc = 20.78799996946

Median: ma = 37.47110601665
Median: mb = 20.78219146134
Median: mc = 27.4944302137

Inradius: r = 7.60663039045
Circumradius: R = 20.78550003054

Vertex coordinates: A[36; 0] B[0; 0] C[-0.00435625; 20.78799996946]
Centroid: CG[11.99988125; 6.92766665649]
Coordinates of the circumscribed circle: U[18; 10.39330860526]
Coordinates of the inscribed circle: I[7.605; 7.60663039045]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 150.0087957765° = 150°29″ = 0.52334598864 rad
∠ B' = β' = 89.99901772755° = 89°59'25″ = 1.57109677657 rad
∠ C' = γ' = 120.002186496° = 120°7″ = 1.04771650015 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    