# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 5.66   b = 5.1   c = 5.1

Area: T = 12.00770400095
Perimeter: p = 15.86
Semiperimeter: s = 7.93

Angle ∠ A = α = 67.40879246999° = 67°24'29″ = 1.17664902279 rad
Angle ∠ B = β = 56.29660376501° = 56°17'46″ = 0.98325512128 rad
Angle ∠ C = γ = 56.29660376501° = 56°17'46″ = 0.98325512128 rad

Height: ha = 4.24327703214
Height: hb = 4.7098643141
Height: hc = 4.7098643141

Median: ma = 4.24327703214
Median: mb = 4.74655558157
Median: mc = 4.74655558157

Inradius: r = 1.51441286267
Circumradius: R = 3.06552142386

Vertex coordinates: A[5.1; 0] B[0; 0] C[3.1410745098; 4.7098643141]
Centroid: CG[2.74769150327; 1.57695477137]
Coordinates of the circumscribed circle: U[2.55; 1.70108933912]
Coordinates of the inscribed circle: I[2.83; 1.51441286267]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 112.59220753° = 112°35'31″ = 1.17664902279 rad
∠ B' = β' = 123.704396235° = 123°42'14″ = 0.98325512128 rad
∠ C' = γ' = 123.704396235° = 123°42'14″ = 0.98325512128 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    