13 18 26 triangle

Obtuse scalene triangle.

Sides: a = 13   b = 18   c = 26

Area: T = 107.6844434808
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 27.39993615864° = 27°23'58″ = 0.47882090726 rad
Angle ∠ B = β = 39.58223055699° = 39°34'56″ = 0.69108415577 rad
Angle ∠ C = γ = 113.0188332844° = 113°1'6″ = 1.97325420232 rad

Height: ha = 16.56768361244
Height: hb = 11.96549372009
Height: hc = 8.28334180622

Median: ma = 21.39550928953
Median: mb = 18.48797186126
Median: mc = 8.80334084308

Inradius: r = 3.77884012213
Circumradius: R = 14.12546040127

Vertex coordinates: A[26; 0] B[0; 0] C[10.01992307692; 8.28334180622]
Centroid: CG[12.00664102564; 2.76111393541]
Coordinates of the circumscribed circle: U[13; -5.52330823383]
Coordinates of the inscribed circle: I[10.5; 3.77884012213]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 152.6010638414° = 152°36'2″ = 0.47882090726 rad
∠ B' = β' = 140.418769443° = 140°25'4″ = 0.69108415577 rad
∠ C' = γ' = 66.98216671563° = 66°58'54″ = 1.97325420232 rad

Calculate another triangle




How did we calculate this triangle?

Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS.


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