Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 13.45   b = 6.71   c = 7.62

Area: T = 16.58772142254
Perimeter: p = 27.78
Semiperimeter: s = 13.89

Angle ∠ A = α = 139.5477111583° = 139°32'50″ = 2.43655565588 rad
Angle ∠ B = β = 18.8866088499° = 18°53'10″ = 0.33296244271 rad
Angle ∠ C = γ = 21.56767999176° = 21°34' = 0.37664116677 rad

Height: ha = 2.46765002566
Height: hb = 4.94440280851
Height: hc = 4.35435995342

Median: ma = 2.51436875303
Median: mb = 10.40332410815
Median: mc = 9.92220562385

Inradius: r = 1.19441838895
Circumradius: R = 10.36549289847

Vertex coordinates: A[7.62; 0] B[0; 0] C[12.72659055118; 4.35435995342]
Centroid: CG[6.78219685039; 1.45111998447]
Coordinates of the circumscribed circle: U[3.81; 9.63992765733]
Coordinates of the inscribed circle: I[7.18; 1.19441838895]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 40.45328884167° = 40°27'10″ = 2.43655565588 rad
∠ B' = β' = 161.1143911501° = 161°6'50″ = 0.33296244271 rad
∠ C' = γ' = 158.4333200082° = 158°26' = 0.37664116677 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     