# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 5.7   b = 4   c = 2

Area: T = 2.549999875
Perimeter: p = 11.7
Semiperimeter: s = 5.85

Angle ∠ A = α = 141.3187835483° = 141°19'4″ = 2.4666461521 rad
Angle ∠ B = β = 26.01443520182° = 26°52″ = 0.45440360955 rad
Angle ∠ C = γ = 12.66878124986° = 12°40'4″ = 0.22110950371 rad

Height: ha = 0.87771925439
Height: hb = 1.2549999375
Height: hc = 2.549999875

Median: ma = 1.37702189606
Median: mb = 3.77442548934
Median: mc = 4.82113068768

Inradius: r = 0.42773502137
Circumradius: R = 4.566000228

Vertex coordinates: A[2; 0] B[0; 0] C[5.12325; 2.549999875]
Centroid: CG[2.37441666667; 0.83333329167]
Coordinates of the circumscribed circle: U[1; 4.44990022245]
Coordinates of the inscribed circle: I[1.85; 0.42773502137]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 38.68221645168° = 38°40'56″ = 2.4666461521 rad
∠ B' = β' = 153.9865647982° = 153°59'8″ = 0.45440360955 rad
∠ C' = γ' = 167.3322187501° = 167°19'56″ = 0.22110950371 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    