Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 13.1   b = 8.7   c = 17.35

Area: T = 55.38796762099
Perimeter: p = 39.15
Semiperimeter: s = 19.575

Angle ∠ A = α = 47.2043630346° = 47°12'13″ = 0.82438587684 rad
Angle ∠ B = β = 29.1644245782° = 29°9'51″ = 0.50990121128 rad
Angle ∠ C = γ = 103.6322123872° = 103°37'56″ = 1.80987217724 rad

Height: ha = 8.45549123985
Height: hb = 12.73109600482
Height: hc = 6.3843824347

Median: ma = 12.06604208053
Median: mb = 14.74442785514
Median: mc = 6.95766065722

Inradius: r = 2.82991022329
Circumradius: R = 8.92664674125

Vertex coordinates: A[17.35; 0] B[0; 0] C[11.43992651297; 6.3843824347]
Centroid: CG[9.59664217099; 2.1287941449]
Coordinates of the circumscribed circle: U[8.675; -2.10438525295]
Coordinates of the inscribed circle: I[10.875; 2.82991022329]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 132.7966369654° = 132°47'47″ = 0.82438587684 rad
∠ B' = β' = 150.8365754218° = 150°50'9″ = 0.50990121128 rad
∠ C' = γ' = 76.36878761279° = 76°22'4″ = 1.80987217724 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     