# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 7   b = 23   c = 28

Area: T = 61.8710833193
Perimeter: p = 58
Semiperimeter: s = 29

Angle ∠ A = α = 11.07880164461° = 11°4'41″ = 0.19333478616 rad
Angle ∠ B = β = 39.14986876423° = 39°8'55″ = 0.68332734972 rad
Angle ∠ C = γ = 129.7733295912° = 129°46'24″ = 2.26549712948 rad

Height: ha = 17.67773809123
Height: hb = 5.38800724516
Height: hc = 4.41993452281

Median: ma = 25.3822080293
Median: mb = 16.86597153001
Median: mc = 9.6443650761

Inradius: r = 2.13334770067
Circumradius: R = 18.21553680796

Vertex coordinates: A[28; 0] B[0; 0] C[5.42985714286; 4.41993452281]
Centroid: CG[11.14328571429; 1.4733115076]
Coordinates of the circumscribed circle: U[14; -11.65333100136]
Coordinates of the inscribed circle: I[6; 2.13334770067]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 168.9221983554° = 168°55'19″ = 0.19333478616 rad
∠ B' = β' = 140.8511312358° = 140°51'5″ = 0.68332734972 rad
∠ C' = γ' = 50.22767040883° = 50°13'36″ = 2.26549712948 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    