12 15 26 triangle

Obtuse scalene triangle.

Sides: a = 12   b = 15   c = 26

Area: T = 47.00546540249
Perimeter: p = 53
Semiperimeter: s = 26.5

Angle ∠ A = α = 13.9488491432° = 13°56'55″ = 0.24334471012 rad
Angle ∠ B = β = 17.53664150077° = 17°32'11″ = 0.30660681809 rad
Angle ∠ C = γ = 148.515509356° = 148°30'54″ = 2.59220773715 rad

Height: ha = 7.83441090041
Height: hb = 6.26772872033
Height: hc = 3.61657426173

Median: ma = 20.35992730715
Median: mb = 18.80882428738
Median: mc = 3.9377003937

Inradius: r = 1.77437605292
Circumradius: R = 24.89111522544

Vertex coordinates: A[26; 0] B[0; 0] C[11.44223076923; 3.61657426173]
Centroid: CG[12.48107692308; 1.20552475391]
Coordinates of the circumscribed circle: U[13; -21.22766215059]
Coordinates of the inscribed circle: I[11.5; 1.77437605292]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 166.0521508568° = 166°3'5″ = 0.24334471012 rad
∠ B' = β' = 162.4643584992° = 162°27'49″ = 0.30660681809 rad
∠ C' = γ' = 31.48549064397° = 31°29'6″ = 2.59220773715 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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